Monday, October 31, 2016

Witch's Brew of Glass

Glass pumpkin evocative of chalcedony glass
Courtesy of  Smithsonian Museum store.
In honor of Halloween, we will take a detailed look at chalcedony glass; this is one of, if not the most colorful types of glass ever made. In the seventeenth century, it was extremely dangerous for glassmakers and artists, containing a veritable “witch’s brew” of toxic materials. In his 1612 book, L’Arte Vetraria, glassmaker Antonio Neri presents three recipes of which he is clearly very proud. Each of the three is attended by a complex list of ingredients. He describes the end result this way:
It will be adorned with so many graceful and beautiful areas of undulations, and enhanced with the play of diverse, lively, flaming colors, that truly it will seem nature cannot attain so great a height or grand a prize. [1]
In the same passage, Neri explains the importance of purifying each ingredient and eliminating all contamination. In so doing, he provides a fascinating insight into the thinking of an alchemist. He writes:
There is no doubt that in this art, when the ingredients are well prepared, they permeate the glass with dazzling lively colors. Impurities will ordinarily impede the entry of the tinctures into the glass, and prevent their intimate unification. However, when you open the colors of the metals well, and separate them from their impurities and sediment, their beauty will always by far surpass those that are common and ordinarily made in the furnace. [2]
To Neri’s mind, the metals used as pigments must undergo a process of “opening.” Once this was done, each metal’s characteristic color or “tincture” was free to permeate the glass, provided it was free of impurities. Today we might say that by reducing each metal into an extremely fine powder, the individual atoms more easily disperse in the glass. Neri’s “opening” process usually involved dissolving a pure metal in an acid and then slowly evaporating the liquid, resulting in a fine powder. Most color arises because, once in the glass,  the metal atoms block some parts of the spectrum, but not others. The result is that each metal gives rise to its own hue and only because it is dispersed in the oxygen rich environment of the glass matrix. 

 The striking point here is how the alchemist’s model was a perfectly adequate description for the times, in the same way that the atomic model works for us. Unfortunately, there was less awareness of the negative health consequences in some of these preparations. The evaporation of powerful acids could (and can) certainly cause acute respiratory and tissue irritation. However there were far more insidious dangers lurking in Neri’s chalcedony recipes.
Ribbed vessel, chalcedony glass, 17th century, 
 Museo del Monastero di Santa Giulia, Brescia.

In his first prescription, he dissolves silver, mercury, cobalt, manganese, copper and iron. [3] Some of these have been prepared with sulfur which also ends up in the mix. He evaporates it to a powder and adds it to well seasoned, good quality clear glass along with pulverized chimney soot. He notes “When you stir [the molten glass] thoroughly it gives off a definite blue smoke.” Specifically hazardous in this recipe is the formation of mercury fumes, which are extremely toxic to breathe. 

He advises that in the furnace the glass appears “as red as fire,” but that “master craftsman always pinches off the glass for the job with nippers, and reheats it, in order to make waves, undulations and interplays of the most beautiful colors.” The reheating process is known to modern glassmakers as “striking,” a maneuver that brings out surprising color in some glass formulations. He suggests that this chalcedony can be used to form drinking glasses to more shapely cups, saltshakers, flower vases and similar vessels.

In his second and more sophisticated preparation Neri dissolves the materials in groups, in six separate flasks, only then combining them. He also adds new materials: lead, zinc, “blue painters enamel,” antimony and red varnish. The final recipe for chalcedony introduces new purification procedures and increases the number of separate flasks to nine. Additional ingredients include metal sulfides, ultramarine, tin, arsenic (read: death's calling card) and crimson paint. 

It is tempting to dismiss a few of these ingredients, like red varnish, or pulverized chimney soot; organic materials that would readily decompose in the heat of the furnace. However, Neri is known to have been a careful experimenter and these additions may well have had an effect on the melt, even if not in terms of color. Of the third recipe, which Neri developed in Antwerp, he wrote: 
Many Portuguese gentlemen in the practice of appraising jewels said that nature could do no better. This was the most beautiful chalcedony that I have ever made in my life. While it may be quite laborious and take a long time to produce, the result is fit for a king. I presented His Excellency, the Prince of Orange, with two vessels of this chalcedony, which delighted him greatly. [4]

[1] Neri 1612, p. 34.
[2] Ibid.
[3] Manganese and cobalt were unknown as distinct metals, but were used in their oxide forms, mined as minerals.
[4] Neri 1612, p. 48. The prince of orange was Philip William.
* This post first appeared here on 31 Oct 2014.

Friday, October 28, 2016

Galileo and Glass

Portrait of Galileo Galilei, 1636 (detail),
by Justus Sustermans (1597-1681).
Galileo Galilei lived almost simultaneously with glassmaker and alchemist Antonio Neri. Both were employed by the Medici royal court in Tuscany and both spent considerable time in Florence and Pisa. In Neri's case, possibly also in the Venito and Rome. No direct contact is known to have occurred between the glassmaker and the astronomer, but their paths did cross many times, orbiting like two celestial bodies in the cosmos - albeit one with a bit more gravitas than the other. 

As a youth, Galileo was taught at the Cestello monastery by court mathematician Ostilio Ricci. This was around 1580 when Galileo was sixteen, and Neri was a four year old toddler, living only a block away and attending the Cestello church with his family. Neri's father and grandfather had just been granted citizen status, already well known for their medical prowess, and his father served on the board of the artist's guild based at Cestello. Galileo would go on to become good personal friends with Prince Don Antonio de' Medici, Neri's sponsor. Later, the astronomer would have telescope tubes made by Jacopo Ligozzi, a regular at the Casino di San Marco, where Neri worked as an alchemist and took his first steps into the craft of glassmaking. As Galileo started to experiment with lenses, Neri was leaving Italy for Antwerp and would be absent for seven years. Meanwhile Galileo landed a job at the Florentine court as mathematics tutor to Grand Duke Ferdinando's son, Cosimo II. 

Both Galileo and Neri worked hard for their achievements. In the hindsight of history, innovations are often romanticized into shining moments of inspiration, forgetting the painstaking effort and dogged persistence required to bring those ideas to fruition. For his telescopes, Galileo encountered tremendous difficulty both in the production of suitable glass and in grinding that glass into usable lenses. His celestial observations included sunspots, lunar craters and the planet Jupiter with its moons, which he named "Medicea Sideria" after his Medici benefactors. As these revelations became known, there was a clamor of orders for telescopes from princes throughout Europe and Galileo struggled to keep up. He maintained a circle of trusted craftsmen on Murano in Venice, and elsewhere, but still, the majority of output was unusable.

Initially, he had reasonable success grinding and polishing broken pieces of mirrors. In early 1610, Galileo held a demonstration in Pisa for his former pupil, Grand Duke Cosimo II. A short time later, the grand duke ordered that a special batch of glass be made for Galileo by Niccolò Sisti, for whom Antonio Neri had worked just a few years earlier. At the time, Neri himself was still in Antwerp and would not return until the following year.

Neri returned to Tuscany and wrote his book on glassmaking,  L'Arte Vetraria, but then turned his attention to other pursuits. This, just as Galileo's quest for high quality glass to make his lenses took off in earnest. Neri’s final manuscript places him in Pisa working on alchemical recipes. There was no more optimal moment for the two men to meet; both were working in Pisa, both knew Niccolò Sisti, Neri had just published his book and the astronomer was becoming desperate for clear flawless glass. If such a meeting ever occurred, it has not been recorded, and shortly thereafter, in 1614, Neri died of an unspecified illness.

On 20 December of that same year, four days before Christmas, Tommaso Caccini, Neri's childhood next-door neighbor, delivered a scathing denouncement of Galileo from the pulpit of Santa Maria Novella church. While the sermon earned Caccini a reprimand, and was an embarrassment to his family, it did also serve as a start to Galileo's troubles with the inquisition.

While Antonio Neri may have never encountered the astronomer, shortly after the time of the priest’s death, the astronomer acquired Neri's book on glassmaking. One copy was sent to Rome, to Federico Cesi, founder of the Accademia dei Lincei, a scientific society to which Galileo belonged, and another copy was saved for the astronomer's personal library. Galileo continued his quest for flawless glass and in his correspondence he takes on the same obsession with purity of ingredients that Neri exhibits throughout his book.  

* This post first appeared here in a slightly different form on 18 Novenber 2013.

Wednesday, October 26, 2016

San Giovanni

"Florence - Church of San Giovanni, the Baptistry",
Photo: Giacomo Brogi (1822-1881).
The San Giovanni Baptistery stands in the heart of Florence, directly in front of the city's most famous structure, Santa Maria del Fiore Cathedral, also known as The Duomo. The church and its dome are so large that they dwarf the baptistery by comparison. Nevertheless, a simple look inside its cavernous, octagonal space easily shatters this illusion. In Antonio Neri's time, this place was a civic hub; a space where masons and tailors rubbed shoulders with nobles and princes. One of the oldest structures in the region, it was also one of most cherished, clad in polychrome marble, with imposing bronze doors intricately sculpted by masters. Michelangelo dubbed them "the gates of heaven." It was here, in this ancient basilica that the future of Tuscany could be seen plainly, in the eyes of its youth. New generations of Florentines were welcomed into the world by their neighbors, anointed and christened, as they had been for centuries. The current structure dates to the eleventh century, but it replaces octagonal baptisteries built on the same spot as early as the fourth century, originally surrounded by a cemetery.
Glass Mosaic ceiling of San Giovanni
(Click to enlarge)

Antonio Neri was baptized here, as were all his brothers and sisters, his parents, some grandparents and quite possibly some much earlier relatives. His sponsor, Prince Don Antonio and his Medici ancestors were also given rights at San Giovanni, in the same octagonal marble bath at its center. The unusual font was a sister to the one still standing in the identically named baptistery in Pisa. Along each side, there was a dry-well. By standing in it, a priest could perform the ceremony and avoid jostling by the crowd. Legend tells that one of the stations showed the repair made after poet Dante Alighieri took an axe to a well in order to free a child who had become entangled and was at risk to drown. The font was replaced later in the same year of Antonio Neri’s birth, 1576, on orders of the Grand Duke, in preparation for a royal baptism.

The ancient mosaic tile floor, although repaired many times, still shows its original signs of the zodiac and other early Christian iconography. As a newborn infant, tightly wrapped in swaddling, Antonio Neri would have been carried across that floor, busy with families and children, and then gently handed to the priest, perhaps by his father, already a famous physician. Joining them would be his grandfather the barber surgeon, his other grandfather the lawyer to Michelangelo, his godparents, other family, friends and perhaps a wet nurse. His mother stayed at home with her close friends to recuperate from the ordeal of birth, and to prepare for a neighborhood celebration. Even in the dead of winter, if Antonio Neri's eyes were open, the sparkling glass mosaics covering the entire domed ceiling of San Giovanni could not have failed to catch the wandering eyes of this future glassmaker.

*This post first appeared here in a slightly different form on 11 Nov 2013.

Monday, October 24, 2016

Neri and The Inquisition

Insignia of the Inquisition, 1574.
The mandate of the Catholic Church's inquisition was to stamp out heresy. Although empowered to impose sanctions that included torture and execution, such extreme measures were not imposed casually. Nevertheless, the Holy Office of the Inquisition  was not an organization with which to trifle. In 1600, just over a decade before Antonio Neri's glassmaking book was printed, former Dominican friar Giordano Bruno was convicted of heresy and burned at the stake in Rome's Campo de' Fiori market, albeit after nearly a decade of confinement and numerous opportunities to recant. Shortly before that, the inquisition ordered Neapolitan polymath Giambattista della Porta to disband his group of scientific investigators and to cease all publication without special written permission from the Church, an order with which he readily complied. Famous French essayist Michel de Montaigne complained of having books confiscated upon entering Rome, although in Florence he was welcomed with open arms by Francesco de' Medici at the Casino di San Marco, where Antonio Neri would later work.

There was special attention paid to books, because they carried the potential to 'corrupt' large numbers of people over a wide geographic area. In the Church's view, heresy was considered a disease of the mind, the devil's work. Books were seen to be a potential source to spread the infection, especially books from the Protestant quarters of Europe, but also from the 'misguided' notions of early scientific investigators.

The last page of Neri’s L'Arte Vetraria [The Art of Glassmaking] is devoted to the official permissions that were necessary to print and sell the book. Here we read that Pie[t]ro Niccolini, Vicar of Florence (a man destined to become the archbishop) ordered Canon Filippo del Migliore of the Florentine archdiocese to review the manuscript. Upon doing so, he found nothing that "contrasts with Christian conscience." Next, it was passed to the Holy Office of the Inquisition, where the head inquisitor of Florence, Fra Cornelio Priatoni from Manza, assigned that the manuscript be reviewed by Agostino Vigiani, Regent of Servants. Final approval came from Florentine Senator Niccolò dell’ Antella.

Within a few years, Cornelio Priatoni would  be embroiled in the investigation of Galileo. In fact, the reviewers of Neri's glass book reads like a cast of characters from the initial investigation of the famous astronomer. The Galileo case would also include Ferdinando Ximenes, the brother of Antonio Neri's good friend Emmanuel. Ferdinando was prior of Santa Maria Novella where the inquisition was based. In fact, Emmanuel's uncle, after whom he was named, also worked in the Holy Office of the Inquisition in Florence and would later give testimony in the Galileo affair.

Writing that could be perceived to defy the Church's teaching was a serious concern for authors in Italy, even those under the protection of the liberal Medici family. Although not overtly heretical, Neri's other manuscripts could have easily fallen into this category. Thankfully for our alchemist and glassmaker, upon reading Neri's book, Vigiani stated "I have not found anything repugnant to the Christian conscience and good customs, but [a book] full of things and natural secrets, no less useful than curious." 

This post originally appeared here in a slightly different form on 13 November 2013.

Friday, October 21, 2016

Solid Water

Rock crystal cup , around 1550,
 Museo degli Argenti, Palazzo Pitti, Florence
(click to enlarge)
In the ancient world, certain natural materials commanded a premium and rock crystal was among the most coveted. Large completely transparent crystals of quartz were found in caves and glacial moraines and craftsmen managed to work them into exquisite cups, vessels and ceremonial objects. By the time the Renaissance arrived, the demand for rock crystal drove much of the innovation in glassmaking. Indeed, clear glass was very much sought after and thought of as an artificially produced form of rock crystal.

A standard line in the historical narrative tells that the ancient Greeks believed that rock crystal was a form of solidified water, the word “krystallos” meaning ice. Enough written material survives from the likes of Herodotus, Pliny, Seneca and Saint Jerome to know for certain that one version or another of this idea has been around for a few thousand years. It is a line that usually gets attention for all the wrong reasons; when stated so glibly, it does not throw any light on ancient culture or our connection to it and worse, it plays into the fiction that we are somehow very much more astute than our relatives of 150 generations ago, that our progenitors were quaintly uninformed. 

Instead, think of “solidified water” as part of a working model of the world. It was consistent with the prevailing conception of nature in the same way that, for modern physicists, eleven-dimensional string theory serves; it seems to be correct, to the best of our knowledge, but the chances are good that there is more to the story yet to figure out. Like string theory, solid water is not a concept that would have a strong bearing on the daily lives of most people. For specialized artisans, it did make good sense; to thinking of rock crystal in this way would be a reminder that if treated too roughly, the material would shatter into pieces as if it were ice.

In the fifteenth century, the Venetian island of Murano became the center of the universe for glassmakers, and it stayed that way for the next four centuries. Of all the many forms that glass can take, the one that made Murano most famous was cristallo; named after the mineral it so closely imitates. The genius of cristallo was in bringing together diverse techniques and ingredients to form a product that was clear like water, yet could be worked thinner and in more complex designs than was possible with carved rock crystal.

 The hallmark of cristallo was the specific use of Levantine soda ash and white quartz river stones (tarso) as opposed to sand and it became the pinnacle of the glassmaker’s art. For the first time, artisans combine best practices with premium raw material sources, the extra purification steps, the careful avoidance of iron contamination, the hot glass washing process, the clean burning hardwood fire and the manganese color correction. In Venetian furnaces, even the clay for the crucibles was a special product imported from Constantinople, which did not contaminate the melt.

In 1450 the Christian world was dealt a severe blow by the Byzantine Empire’s fall to the Ottomans and with it went the Venetian’s major trading partners. That same year, the Murano glassmaker Angelo Barovier is given credit for the development of cristallo. He was the man responsible for bringing together the ultimate refinements that elevated glass to a new level of perfection and created a national product for Venice when they sorely needed it. These techniques and materials were all available and utilized by glassmakers individually at least fifty years earlier, but not together in a single product. Barovier had attended lectures by noted alchemist Paola de Pergola, at the School of Rialto. This indicates that he was thinking along the lines of a chemist in putting together a repeatable regimen for an exceptionally clear, bright, workable product. Barovier’s innovation would become a tradition that was carried on by countless glassmakers and ultimately by our Florentine priest Neri more than a century and a half later.

In seventeenth century Florence, Grand Duke Cosimo I de' Medici negotiated for Venetian masters to teach and practice their coveted techniques in Tuscany. Royal architect and polymath Bernardo Buontalenti was credited with the development of an artificial rock crystal, Tuscany’s own version of cristallo. It is an open question whether we see his hand in Neri’s recipe number seventy-six in which actual precious rock crystal is crushed and used as raw material for glass. In any case, Buontalenti’s continued presence at the Casino must have been an influential experience for his former pupil Don Antonio de' Medici, Neri’s sponsor. Our glassmaking priest was impressed enough with this technique to use rock crystal as the basis for his artificial gems. In turn, Neri’s chapter on artificial gems received the most attention, by far, of any other single subject in his groundbreaking book on glassmaking, L’Arte Vetraria. His work on this subject took on a life of its own and was the subject of plagiarism and unattributed derivative works well into the nineteenth century. An argument can be made that his lead glass based gems fueled the revolution pioneered by English glassmaker George Ravenscroft in what has become the current pinnacle of clear glass: lead crystal.

Wednesday, October 19, 2016

Black is Beautiful

Black glass cameo vase, c. 1900
Thomas Webb.
Antonio Neri was a technical adept, a student of alchemical history and a glassmaker extraordinaire. He was also a gear in the Medici innovation machine. The glass recipes he developed were likely put to work in the glass shops sponsored by the ruling family in Florence, Pisa and elsewhere. Making advances in technology gave the region a competitive advantage; encouraging the arts cemented a reputation for creativity that endures to this day throughout Tuscany.

Black is one color that has given glassmakers difficulty ever since the material's invention over four thousand years ago. It is easily approximated for large, heavy objects, but to achieve a true solid black in blown vessels, or thin layers is a challenge even for current technology.

Obsidian is a naturally occurring volcanic glass that was prized in antiquity, most often occurring in black or very dark brown. In prehistoric times, it was coveted for cutting tools and arrowheads. As technology advanced, it was ground and polished for mirrors. Later, obsidian became popular in ornamental objects ranging from dinner plates to jewelry. The production of obsidian, gemstones and other natural materials through artificial means was a quest that kept glassmakers busy.

In many ways, making black glass shows the other side of challenges in making colorless crystal; instead of a formulation that will transmit virtually all the light falling on it, the aim is to produce a glass that will absorb virtually all illumination. In his book, L' Arte Vetraria, Neri presents three recipes for "velvet black" glass (# 51-53), and three recipes for black enamel (#100-102).

His first black glass is made with the discarded broken pieces of "glass of many colors." To this, he adds 'zaffer,' a cobalt ore used to produce deep dark blue, and manganese, which produces a magenta color. He advises that it will be good for bead making cane and other work. For his second black glass, he starts with high quality frit to which he adds lead and tin oxides. This forms an opaque, white lead crystal, which he tints with calcined "steel" (probably bronze) and pulverized iron flake. He claims that after twelve hours "the glass will be a most beautiful velvety black." Neri's ultimate black glass is his simplest. He starts with his 'rocchetta' frit, and adds the dried, pulverized dregs left in red wine casks, advising us to go slowly since it froths up. He allows it to cook on the fire for four full days, and finally "washes" the glass by flinging a ladle-full at a time into clean cold water. He then re-melts it; "You will have a black fit for any job and more marvelous than all the other blacks of which I have written."

* This post first appeared here on 8 November 2013.

Monday, October 17, 2016

Alessandro Neri

Ecce Homo by Titian, circa 1570-1576
Antonio Neri was the son of a royal physician and the grandson of a well respected barber-surgeon. At the turn of the seventeenth century he pursued a career as a priest in the Catholic Church, but with the rare distinction of alchemy as his specialty. He is best remembered for his book on glassmaking, but he also wrote on the subjects of chemistry and medicine; an area of study that his family had embraced and would continue to practice  for several generations. 

According to Florentine genealogy records, Antonio's mother died in 1594, at the age of 42. She had given birth to ten children; Alessandro was the youngest, born in 1587. The same year as her death, the family would loose, Antonio's grandfather Jacopo, the barber surgeon. He had moved the family back to Florence after the turbulent 1520s; the years of what would be the final attempt to re-establish a self governing republic.  In 1598, just as Antonio finished seminary his father died leaving his ten children orphaned. A year later fifteen year old Emilio died on Christmas day.  Details of how the family survived this series of calamities may never be known, but in the end it was the youngest child, Alessandro who inherited the family house and fortune. Only eleven years old at the time of his father's death, an administrator was appointed by the court to oversee his and his siblings interests until they were of age. By all indications, the Neri children were well cared for; the list of godparents reads like a who's-who of the Florentine elite, including wealthy bankers, lawyers, senators and curia officials at the Vatican.

Alessandro would become the royal physician’s main heir. We might expect this honor to fall to the eldest son, and how the youngest of the seven brothers could end up in this position is a matter ripe for conjecture. Antonio and perhaps Francesco were in the clergy and therefore ineligible. We can surmise that the first of the sons named Jacopo died in infancy and if the second Jacopo survived he along with Vincenzio were somehow also out of consideration. One compelling scenario passes the family inheritance to fifteen-year-old Emilio, who would also die within a year leaving the mantle to Alessandro. Not yet of legal age, the family assets would have been held in trust, perhaps by his mother’s brother, notary Agostino Parenti.

Future research will likely uncover more details about the family after Antonio's death in 1614, however, a nice outline is already in place. In 1620, Alessandro inherited a second house from his uncle Agostino. It was located outside the city walls in a wealthy neighborhood, just to the southeast of Florence. It was along the old road called Via del Ponte a Ema.

In a 1630 court case in Rome, Orazio Morandi, abbot general of the Vallombrosans gave testimony. One  incidental remark he made indicates he was a Neri family friend; he told prosecutors that when he lived in Florence he often saw fellow astrologer Simon Carlo Rondinelli at the home of Alessandro de’ Neri. [1]

Although the exact date is not clear, Alessandro would marry Caterina di Becci and have three children; Neri, Dianora and Filippo. We can speculate, the first two were named after their grandparents, and the third after Saint Philip, canonized in 1622. Dianora was married to Ottaviano Buonaccorsi and had a son named Alessandro.

The bloodline would continue for another generation through Alessandro's son Neri, who would enroll in the medical program at Pisa and become a physician in his own right, taking a degree in 1646, where his diploma is still on file. [2] He in turn would marry Margherita Scalandroni who gave birth to Ottaviano. Alessandro, Francesco and Caterina.

At the end of the seventeenth century, historian Giovanni Cinelli wrote about our glassmaker’s nephew, who at the time had been practicing medicine for twenty years:
Succeeding M. Neri Neri, is a grandson [Neri di Alessandro], alive today, [1677] a man of good taste, who is delighted by pictures and sculpture, who has imitated his grandfather Neri, by [collecting] many paintings and gallant statues by talented artists. Two small bronze horses by Giambologna, many works of [Simone] Pignoni and others, among which are two marvelous holdings; a waist-up Ecce Homo by Titian and a Satyr of beautiful ancient bronze which is wonderfully captivating; it is of the Greek manner and expresses an attitude of prompt movement that recalls liveliness, the muscles are very well prepared. Finally, a statue of Cupid flanked in marble in the best Greek style. [3]
The elder Alessandro’s daughter, Dianora, would marry Ottaviano di Camillo Buonaccorsi, who gave birth to seven children. Her son named Francesco would marry into the Medici Family, coupling with Aurelia de’ Medici, daughter of Luigi di Francesco.

In 1768, historian Domenico Maria Manni wrote about the family. [4] In a short pamphlet about ancient Christian tombstones, he reports on the lineage of his patron, Girolamo Neri, a Camaldolese abbot. It traces the family back through two centuries, back to our doctor Neri Neri and to Antonio the glassmaker. Manni connects Girolamo to the family through the elder Antonio, the brother of Jacopo Neri, the barber surgeon.

Although further work is needed, all indications are that our glassmaker’s branch of the family died out by the end of the eighteenth century. [5] The family arms do not appear in use again, nor is there any evidence of a Neri tracing his heritage to the noble family of physicians. It seems finality is provided by Manni. He references a court judgment which awarded inheritance of the property of the extinct branch to Girolamo Neri’s kin. 

[1] Dooley 2002, p. 32. Dooley states that Alessandro is not related to Antonio Neri, but I feel otherwise; the name, timing, and circumstances are a perfect fit. His conclusion may be based on the scant family history available to him. Cf. ASR 1630.
[2] Mazzatinti 1917, p. 44, n. 549.
[3] Cinelli 1677. 
[4] Domenico Maria Manni, a member of the Messina scientific society known as the Accademia Pericolante. Manni was a prolific historian, although has on occasion been accused of careless work. For instance, he misidentifies Antonio’s mother as ‘Dianora di Ser Agostino di Ser Francesco Parenti’ Manni 1763, p. i-vi.
[5] Mecatti 1754, p. 77; Manni 1763, p. v.
*This post first appeared here on  29 Oct 2014.

Friday, October 14, 2016


Sea fight with Barbary corsairs, c. 1581
Lorenzo Castro.
In the early seventeenth century, shipping goods and travelers around the world was big business; life on the high seas was an excellent way to find adventure, make a fortune or even become famous. On the other hand, it was also an excellent way to lose one's freedom, lose a fortune or lose one's life. International trade affected Florentine glassmaker Antonio Neri in at least two major ways; first as a consumer of exotic materials and second as a traveler. Land routes were plagued by highway robbers, corrupt officials and a host of other problems that included keeping perishables viable over long journeys, keeping pack animals in good health and navigating unreliable roads. Transport by sea promised a potentially quick journey, but at the risk of bad weather, water damage and the dreaded scourge of pirates. Aye.

In early 1604, Neri traveled to Antwerp to visit his friend Emmanuel Ximenes, who as it happens was himself an international banker; he provided the financial backing for trade expeditions to the Far East, Brazil and Africa. His extended family ran what today would be recognized as a vertically integrated corporation. The control of raw materials, to the supply chain, through to finished products was under the common management of the family. It is an open question if the Ximenes supplied Neri with materials for his work in Florence, but it is undoubtedly the case for his seven year long visit to Flanders. 

With Ximenes extensive shipping connections one might well ask why Neri did not take a boat from the Medici’s port of Livorno near Pisa, sail to one of the Spanish or Portuguese ports, where Ximenes had family and then on to Antwerp which was, after all a Spanish domain. It would be faster and one might think safer, weighed against the very real perils of violence, highway robbery and a host of other dangers when traveling by land. 

The sea route, however, was in fact far more problematic and dangerous. The Mediterranean was teeming with pirates and privateers. Privateers were state sponsored raiding parties, who commandeered the trade ships of their enemies and split their bounty with the government, often stranding the crew or selling them into slavery; it was a very lucrative enterprise, even if often short lived. Pirates, on the other hand, were independent operators, commonly they were former navy men who had lost their commission or otherwise ran afoul of their sovereigns. Basic equipment for any pirate was a chest of flags of the various nations. For any ship encountering another vessel on the high seas running under the same flag, the very first order of business was to ascertain if it was a friend as presented or a foe in disguise. An elaborate series of secret signals would follow. To complicate matters, the signals were sometimes compromised or changed without notice.  For the Spanish treasure ships returning from South America, evading pirates in the Caribbean at the start of a journey was matched by similar perils the last few days before making port in Spain. Tuscan and Venetian ships were in conflict with the Ottomans, but did conduct trade with them through intermediaries. The Dutch were undercutting Spanish deals in the Far East, while the Spanish paid cash bounties for any ship caught trading south of the equator. Meanwhile, the English were at war with the Spanish, trading with the Ottomans, but amicable with the grand duke and Tuscany.

The Barbary Coast in Tunisia, a short distance from Italy,  was a popular haven for pirates. Infamous at the time was Captain Jack Ward, [1] an Englishman who found shelter with the Ottomans through the local governor [2] to whom he paid ten percent of his bounty. Ward with his crew had converted to Islam and caused no end of grief to all European shipping. This included traders from Spain, the Netherlands, Britain, France, Tuscany and Venice. Ward had amassed a fleet of his own based on the African coast in Tunis. From here he conducted operations as far north as Ireland, running them under the Tuscan flag as well as numerous others.

Despite all these issues, for Neri, the biggest impediment by far to traveling by sea or by land was that he was heading into a war zone. Antwerp was the calm at the center of a bloody conflict that thrashed and destroyed the surrounding countryside. The Dutch fleet had blocked the city port on the Scheldt River and opposing armies clashed in a great ring around the Low Countries. This is what Emmanuel Ximenes was alluding to in his letter of December 1602 when he said “the lack of peace in these countries prevents me from recommending them for you to come or not” [3] The northern Netherlands were in the midst of a war for independence against Spain and the Holy Roman Empire.  These two superpowers of Europe were governed by the same tightly-knit Habsburg family, who at the time controlled what are now Portugal, Spain, Southern Italy and Flanders on one side of the family; Germany, Austria, Hungary and Transylvania, on the other. At the same time, the region had become a haven for formerly Jewish "New Christians" (like the Ximenes family) after their expulsion from Spain. [4] The city was blocked from sea trade by their Dutch neighbors to the north and armed confrontations with imperial troops from the south demolished surrounding towns. The conflict threatened to spill into the city for which Neri was bound.

The other way that international trade affected Neri was through the materials so necessary to glassmaking, to medicine and to his other alchemical activities. As our priest makes clear in his book, the quality of ingredients must always be tested and assayed before purchase or use. Unscrupulous merchants could and did mix or dilute expensive materials with inexpensive fillers and made unreported substitutions. The level of mistrust over imported ingredients can be better appreciated through an understanding of just how chaotic life was on the high seas. Even generally honest traders might turn to deceptive or otherwise questionable business practices when faced with the staggering losses of an entire ship and its contents. 

As the first decade of the seventeenth century unfolded, the pirating of trade ships turned into a well-organized and quite profitable occupation. Operations blanketed the entire Mediterranean and the eastern Atlantic from the Canary Islands to Ireland, which as we have seen complicated Neri’s travel arrangements in the region. Captain John (Jack) Ward was based in the Algerian and Tunisian Barbary Coast and commanded a formidable armada. Dutch born Zymen Danseker (Simon the Dancer) specialized in raiding Spanish and Portuguese trade ships. Much to Spain’s dismay, the Dutch set up outposts in India, Africa, Asia and the Americas circumventing the Habsburg’s previous monopoly.

As pirating became endemic, friction started to build between competing interests. The British and the Florentines clashed often in the Mediterranean. The grand duke employed English mercenaries to harass Turkish (Ottoman) vessels. The Ottomans were valued trading partners to the London based Levant Company. The Ottomans, upon seeing a ship manned with Englishmen, did not know whether to extend a welcome or to prepare for a fight.  Meanwhile, from his Barbary base of operations, Captain Ward continued to take British ships, strand crews and reap the rewards. All the while, he seemed to enjoy an indifferent if not outright amicable relationship with Grand Duke Ferdinando. This “understanding” developed after the sound thrashing Ward received, in 1607, at the hands of the Knights of Malta and the Knights of Saint Stephen. Once a pecking order was established with Florence, Ward did very well for himself. In June of 1608, the following description was given at court in London and then repeated to the Venetian senate through their ambassador. 
John [Jack] Ward, commonly called Captain Ward, is about 55 years of age. Very short, with little hair and that quite white; bald in front; swarthy face and beard. Speaks little and almost always swearing. Drunk from morn till night. Most prodigal and plucky. Sleeps a great deal and often on board when in port. The habits of a thorough "salt." A fool and an idiot out of his trade. [5]
This "idiot" outlived many of his detractors, evading capture and sleeping late until the ripe old age of seventy. For a man of his occupation this was a remarkable accomplishment. Reports claim he succumbed not to the sword of a British officer, but to the ravages of the plague in 1622.

[1] Jack (alias John, Birdy) Ward (c.1553–1622),Also known as Siemen Danziger, Zymen Danseker, Simon de Danser, Danziker, Dansker, Danser and later after conversion to Islam, Yusef Re’is or Reis.
[2] Uthman Bey.
[3] Ximenes 1601–11, 5 Decembre 1602.
[4] For an excellent synopsis of the historical events leading up to the 80 years war see Christman 2005.
[5] Brown 1904, (no.268 ), 23 June 1608; see also (no. 2), 6 June 1607; (no. 7), 11 June 1607; (no. 33), 21 July 1607; (no 34), 25 July 1607; (no. 112), 15 Nov 1607; (no 319), 4 September 1608.
* This post first appeared here 24 Oct 2014.

Wednesday, October 12, 2016

Gift For The Innocent

One of the distinctive roundels designed
by Andrea della Robbia for the facade of the
Ospedale degli Innocenti.
In early 1597, Antonio Neri turned twenty-one. He was in his final year of training for the priesthood in the Catholic Church. The war with the Ottoman Empire in Hungary was winding down and men were returning to Florence from the front lines, among them Don Antonio de' Medici, Neri's future benefactor. At this time, there is no indication of Neri's future activity as a glassmaker, but he certainly had been deeply involved in learning alchemy for several years. It is not surprising since his father was the personal physician to Grand Duke Ferdinando de' Medici and his grandfather was a celebrated barber-surgeon. He probably grew up seeing the chemical arts practiced on a daily basis. 

This same year, Antonio Neri's father, Neri Neri, was commissioned along with three colleagues from the physician's guild to make a complete revision of the Ricettario Fiorentino. [1] This was the physician and apothecary's reference used throughout Europe and in Tuscany it carried the weight of law; every medical professional was required to own a copy and adhere to its prescriptions. The first edition had been published almost a century earlier; it was revised periodically to keep it current with the latest thinking and remedies. 

Reviewing the book's recipes is of course interesting. The final prescription, for example, is one for the age-old remedy of chicken soup. However, the preparation of this particular recipe with its raw juices would certainly make most modern patients turn a bit green.  An attempt to look beyond the technical methods is also intriguing; we are rewarded with a glimpse into the personalities of the men who wrote the book. One of the authors in particular has a story that illustrates how shrewd maneuvering can be used for good, even in times when self-serving and corruption were endemic.

The four authors' names do not appear in the book itself, but they are documented in a letter from the college of physicians acknowledging the directive of the grand duke and pledging to purge the text of any preparations that could be dangerous. [2] In addition to Neri Neri and Francesco Rosselli (son of the royal apothecary), the other two co-authors were Giovanni Galletti and Giovan Battista Benadù. [3] Giovanni Galletti, is difficult to pin down. His family resided in Florence and he exchanged letters with a Filippo Galletti in Rome, who may have been a brother or cousin. Adding intrigue to the connection, Filippo was working as a confidential correspondent—read: a spy—for Ferdinando I de' Medici around 1600. [4] The fourth co-author, Benadù, a physician and surgeon from Fivizzano, north of Pisa, died in 1603. [5] His will provided for an annual gift to Santa Maria Nuova hospital [6] and another to the Ospedale degli Innocenti, a gift that amazingly supported the orphanage into the nineteenth century. [7]

Little information exists about these men, it would seem impossible to extract any meaningful insight into their personalities, but perhaps we can take a small step in that direction. Neri Neri's coauthor, Benadù, administered his financial gift to the Ospedale degli Innocenti with a large dose of shrewdness. The measures he took to ensure the purposeful use of his money, even after his death, reveal a man who cared a great deal about the less fortunate. In the 1400s, the wealthy silk merchants’ guild started Innocenti to be responsible for the welfare of abandoned children. By the late 1500s, the orphanage struggled under a mountain of debt. Grand Duke Ferdinando made a concerted effort to improve the situation and it became a well run, efficient institution, although throughout its history, it was not without problems. Over centuries of operation, it had seen the abuse of children and exploitation by both parents and the government. Famine hit Tuscany on a regular basis and less of it was due to natural causes than one might imagine. The grand dukes tended to make large trade deals, with Spain and other states, which depleted supplies and drove the local price of grain beyond what poorer families could afford. In those hard times, the Ospedale degli Innocenti experienced overflows of abandoned children. It was discovered under Cosimo I de' Medici's rule that some desperate families had found creative ways to take advantage. Destitute mothers left their infants at Innocenti, where children were assured of a square meal, a warm bed and an education. The same mothers then sold their milk to the orphanage, in effect collecting a wage to wet nurse their own children.

Florentine accountants invented double entry bookkeeping, and the Medici gave that innovation a good workout. They pioneered the use of municipal bonds, the purchase of which was sometimes made compulsory. At the time, they were a novel approach to fund a city’s development, and selling bonds under the banner of the orphanage was an early bit of marketing genius. It is unfortunate that the money often did not stay with the orphanage, but the obligation to pay off these debts did. The Medici often raided the accounts to pay for other projects both civic and personal. Under Ferdinando, the situation improved, but was far from stable. Through a clever maneuver, Benadù ensured his money went to the orphanage alone and not to bondholders. He left an inheritance for the day-to-day operation of Innocenti, putting control in the hands of the monks at the Badia Fiorentina monastery, where it was beyond the reach of greedy hands.

The 1597 edition of Ricettario Fiorentino produced by Neri Neri, Francesco Rosselli and their colleagues proved so popular that Grand Duke Francesco II [8] ordered it reprinted without changes in 1623. [9]

[1] Neri, Benadù, Rosselli, Galletti 1597. 
[2] Corradi 1887, p. 55.
[3] Giovan Battista di Nicolao Benadù (?–1603), not to be confused with Priest Giovanni Benadù from Lucca.
[4] For more on the Galletti family cf. Crollalanza 1878, p. 222. About Filippo Galletti cf. Zapperi 1994, pp. 50, 71; Liebreich 2005, pp. 67, 281. For letters to Giovanni, see ASR 1591.
[5] He set up a trust fund for his sisters and their female relatives, which was still functioning in the twentieth century. Cf. Arrigoni 1882, p. 34.
[6] Lamioni 1994, p. 530.
[7] Cardini 1968, p. 190. The Innocenti records identify Benadù as both physician and surgeon and his monetary gift played a supporting role in the continued operation of the facility (AOI 1603.) As mentioned above.
[8] Ferdinando II de’ Medici (1610–1670).
[9]  Neri, Benadù, Rosselli, Galletti 1623.
* This post first appeared here 15 Oct. 2014.

Monday, October 10, 2016

The Purse of Envy

Antonio Neri, "The Mineral Gold"
Tesoro del Mondo
Ferguson 67, f. 5r.
As a young man, Antonio Neri faced a decision that had confronted virtually all accomplished artisans since the dawn of time and continues to do so today; whether or not to freely share hard-won technical knowledge with others. The indications are that Neri's thinking on the subject evolved over his lifetime. Testimony given by Florentine metals refiner Guido Melani indicate that as a twenty-year-old, Neri was willing to share his most precious secrets, albeit reluctantly.

Melani reported that in July 1596, Neri performed a transmutation of base metal into "twenty-four carat" gold. Upon being pressed, Neri confided that he had learned the secret from a German, who performed the gold transmutation with a "tablet of medicine." The German told him the medicine was nothing but the simple quintessence of green vitriol and the method to produce it was described by Paracelsus.[1]

The motivations for keeping techniques secret are obvious; potential monetary reward and personal prestige. Aside from the immediate gratitude of confidants, the motivation for sharing technical secrets can be more subtle; the satisfaction of serving a greater good by advancing the art. It is indeed an ancient and very human dilemma. Five centuries before Neri, in the early 1100s a glassmaking Benedictine monk wrote on the subject. In Hesse, Germany, Theophilus Presbyter penned these lines in his De Diversis Artibus [On Various Arts]. "Do not hide His [God's] gifts in the purse of envy, nor conceal them in the storeroom of a selfish heart" and "Do not hide away the talent given to you by God, but, working and teaching openly and with humility, … faithfully reveal it to those who desire to learn."[2] Although it is doubtful that this particular writing was ever seen by Neri, his access to the most extensive libraries in Italy, along with his knowledge of Latin and the writings of other alchemists ensured a comprehensive understanding of his subject and the politics surrounding it.

Two centuries after Neri's death, historian Francesco Inghirami published details of an incident, which if true, might have contributed to a change of heart with our priest:
He [Neri] claimed he had found the secret of making the famous philosopher's stone and it was said he had discovered it among some of his confidants.  Some thugs learnt of this and attacked him at night, in order to obtain the secret by force. He shrewdly gave them a certain recipe he had in his pocket and explained the figures written on it, claiming it to be the secret oil required. But that night, Neri left Florence and traveled to various parts of Europe.[3]
Nevertheless, in his travels to Antwerp it is clear that Priest Neri continued to share his knowledge of glassmaking, in the shop of Filippo Gridolfi, and of course, upon his return to Florence seven years later in the publication of his famous book, L' Arte Vetraria.[4] In contrast, on the subject of transmuting gold and silver, Neri had decided to take his secrets with him to the grave, a decision that he justifies in a manuscript, Discorso, which he completed shortly before his death:
We must also consider the danger to its possessor if it became known to others and particularly to the princes. For that reason even if someone knows and practices this art, he is obliged to keep it hidden and to conceal it; and I know of what I speak.[5]
Neri outlines his fears that such a momentous discovery, if generally known could lead to abuse of power, a collapse of the monetary system, and general chaos in society. In spite of his deep reservations, we see a final glimmer of his innate desire to share. He did, in fact, leave behind his recipe for the philosopher's stone, but in coded, obscure language that has never to this day been deciphered. As he put it: "I wrote the words so strangers will not understand." 

[1]  Galluzzi 1982, p. 53; Grazzini 1983, pp. 214–216. 
[2]  For modern English translation see Theophilus 1979. 
[3]  Inghirami 1841–44, v. 13, pp. 457–458. 
[4]  Neri 1612.
[5]  Grazzini 2012, pp. 329, 356.
*This post first appeared here on 6 November 2013.

Friday, October 7, 2016

Antonio Who?

Medallion dedicated to Antonio Neri,
19th cent.(?), Artist unknown.
La Specola (Museum of natural history),
Florence, Italy.
Since there are many new readers of this blog, I thought a short primer might be in order. Posts here are all related in some way to a seventeenth century Italian priest named Antonio Neri. Occasionally the connection is tenuous, but always in the spirit of exploring his work and times as he experienced them. The blog is named Conciatore, which was a term used in sixteenth and seventeenth century Florence, Italy to describe specialists who formulated glass. Until very recently, our star, conciatore Antonio Neri, was known almost exclusively as the enigmatic author of the first printed book devoted to making glass from raw materials. 

The book's original title in 1612 was L'Arte Vetraria, [1] which translates to "the art of glassmaking," although, in 1662 Neri’s first translator, English Physician Christopher Merrett, chose to simplify the title to The Art of Glass. [2] The book would spread throughout Europe and became a bible of glassmaking for two centuries. Neri's original Italian was translated, retranslated and even plagiarized.[3] Over two dozen editions were published before 1900 in English, Latin, French, German Spanish and more recently in Japanese.[4]

There are manuscripts, papyrus scrolls and even cuneiform tablets that contain glass recipes far older than Neri's book. However he was the first into print, and perhaps more significant, his book was specifically devoted to the common man, stating in his introduction that the only qualification necessary to make glass successfully was the possession of a "kind and curious spirit." In a time when trade secrets were closely guarded assets, Neri assures his readers that, "given a bit of experience and practice, as long as you do not purposely foul-up, it will be impossible to fail," (provided, of course that one had access to the raw materials, a glass furnace and tools).

In his English translation, Merrett stated that he had tried and failed to find out anything whatsoever about the author. A mystique grew around Neri and his identity. He was a Catholic Priest and an alchemist. Stories endure to this day that he had been chased out of Florence over the secret to transmutation; changing base metals into gold and silver. While we now know that transmutation is not possible through ordinary chemistry, the story of his harassment does apparently have a basis in fact. 

Some historians felt such a minor character with few achievements to his name was not worthy of serious study and that is the way things stood for a very long time. More recently, careful research into contemporary records, manuscripts and letters has gone a long way to revealing Neri as a quite interesting character. At the beginning of his career, he worked for Medici prince Don Antonio at his palace-laboratory on the north side of Florence. After a couple of years, he moved to Pisa and lent a hand at a secondary Medici glass facility. A bundle of letters has survived from his friend in Antwerp, Emmanuel Ximenes. [5] Ximenes turns out to have been one of the wealthiest men in Flanders. After corresponding for a few years, Neri traveled to visit Ximenes and stayed for seven years, making some of the "best glass of his life." Finally, he returned to Florence and settled down to write his famous book. 

Far from the poor itinerant priest supposed by some, Neri turns out to be from a prominent patrician family. His father was the personal physician to Grand Duke Ferdinando de' Medici. His grandfather was a well-respected barber-surgeon and a close friend of poet Lodovico Domenici. His other grandfather (on his mother’s side) was Michelangelo's lawyer. Credible evidence in the Florentine State Archives supports the family's claim to being a distant cousin to Saint Philip Neri. [6]

He had nine siblings, three sisters and six brothers, although one brother died as an infant and another at age sixteen. The Neri children enjoyed a cadre of godparents that included the archbishop of Florence and members of the papal curia. The family went on to produce more physicians, and even marry into the Medici family before a lack of male heirs caused this branch of the Neri's to go extinct.

Over his lifetime, he is known to have written a dozen manuscripts,[7] many but not all of which are now lost.[8] He became a dedicated Paracelsan and thousands of pages of his experimental work survive today in the notebooks of his assistant Agnolo della Casa. In the final couple of years of his life, Antonio left glassmaking behind to devote his full attention to wider pursuits in chemistry and medicine. These were disciplines he had practiced his entire life. In 1614, he died at the age of thirty-eight. His long time sponsor Don Antonio de' Medici launched a full-scale investigation to find the late priest's recipe for the philosopher's stone, which he had been promised. Neri's friends and associates were interviewed and the Medici prince even went as far as consulting a medium in Venice to make contact with Neri in the afterlife, alas to no avail.[9]

Neri is an interesting character in his own right, but he also provides an excellent platform to explore alchemy in the early seventeenth century. He was a dedicated experimentalist in his work, which gave him a foothold in the coming revolution of our understanding of the natural world. He lived and worked at the same time Galileo tutored the future grand duke in Florence. The astronomer had himself been tutored in mathematics in the Cestello monastery on Borgo Pinti, in sight of the Neri household. The attached church is where Neri’s family attended services and where his father was buried. Galileo later supplied a copy of L'Arte Vetraria to Federico Cesi, founder of the Accademia dei Lincei, one of the first naturalist and 'scientific' societies in Europe.[10]

If you have an interest in the cultural and technical environment that led to our current understanding of chemistry, medicine and more, I urge you to join me here where we regularly strive to catch a glimpse of early modern science through one of its minor characters; glassmaker, alchemist and Catholic priest Antonio Neri. 

[1] Neri 1612, Neri 2003–07. 
[2] Neri 1662.
[3] Neri 1697.
[4] Neri 2007.
[4] Zecchin 1987–89.
[5] ASF 599.
[6] Boer, Engle 2010.
[8] Grazzini 2012.
[9] Galluzzi 1982.

[10] Galileo 1890–1909.
* These references all appear in the "bibliography" page linked on the right.

Wednesday, October 5, 2016

A Fast Calendar

A Seasons clock showing an astronomical year.
Courtesy  of
Yesterday was the fourth of October. Imagine waking up this morning to discover that it is not the fifth but the fifteenth of the month; ten days have gone missing. This is exactly what happened in 1582. In accordance with a proclamation by Pope Gregory XIII, the calendar was jumped forward. The day after Thursday, 4 October, was Friday, 15 October. For the Roman Catholic world, the intervening ten days were removed from the calendar and never took place.

The seasons cycle from spring to summer to autumn to winter and back again as the earth traces its orbit around the sun. Think of this annual cycle as the dial of a giant clock representing the actual length of a year. Divide the face into quadrants, one for each season. When the earth returns to exactly the same place in its orbit around the sun, exactly one year has passed.We can imagine a giant hand pivoting at the sun, pointing out at the earth as it moves around the clock face. The Julian calendar was devised in the Roman Empire and it served admirably for many centuries. But, by the 16th century, it was seriously out of whack. This system set the length of a year at 365¼ days on average, using the fourth year leap year we are familiar with today. This length of time just slightly over-runs the actual orbit of the earth, which is to say that at the end of 365¼ days, the hand of our cosmic clock was a few minutes past its position from when the year started. In this way, each year the calendar began slightly later than the previous year. This discrepancy was ignored, and the over-run eventually accumulated from minutes to hours to days.

Like a clock that ran fast, after many hundreds of years, the calendar had advanced by about ten days.[1] The date system was in need of a major adjustment; the thing that ultimately forced this calendrical reckoning was Easter. The date of Easter is calculated using the beginning of spring. Because the calendar was running fast, the big day fell a little earlier each year. By the sixteenth century, Easter was falling in early March, which was not acceptable to the Church. Various gradual measures were considered to remedy the situation, but in the end, Pope Gregory XIII (along with a handful of mathematicians) decided to make up for the discrepancy all at once; the ten extra days that had accumulated over the millennium were deleted from the calendar; in effect setting the clock back. In addition, new rules were added for 'leap centuries'. This effectively fixed the problem by slowing the clock ever so slightly, so that on average the hand on the clock cycled extraordinarily close to an astronomical year.[2] And so the Gregorian calendar was born.

Other parts of Europe eventually adopted the changes, some sooner than others. In France, 9 December 1582 was followed by 20 December. A letter sent from Italy on November first of that year might well appear at its destination in France the last week of October, seeming to arrive before it was sent. In the Netherlands and Germany some provinces made the changes while others held out until 1700. Protestant countries did not generally adopt the new system until much later. Britain and her American colonies did not make the change until 1752 by which time the calendars were out of synchronization by a full eleven days.

When the Calendar was adjusted in Italy, glassmaker Antonio Neri was six and a half years old; hardly old enough to remember the event. However, by an odd coincidence he was born on a leap year day, 29 February 1576. In any event, he must have experienced some of the stranger side effects in his adult life, especially when traveling. In making the journey to visit his friend Emmanuel Ximenes, in Antwerp in 1604, if our priest stuck to the route suggested by his friend, he would have remained in Catholic territory until the very end of his journey. Once in the Low Countries, the date of the month would depend on the city. In Protestant controlled regions, like Utrecht, the date would suddenly jump backwards by ten days from nearby Catholic regions, although the days of the week would be consistent. Those crossing the English channel, from Calais France to Dover, for example, would experience a similar effect; it might be early May on one side and late April on the other. In such a crossing, one would experience the disconcerting 'Déjà vu' of living the same date range twice, once as Monday through Friday and then again as the following Thursday through Monday.

If there is a lesson here for close observers of nature, it is that daily living in the early seventeenth century emphasized the difference between the natural world and the contrivances of man. Subtle as it may seem to us today, April does not so much signify the rebirth of our gardens, as the rebirth of our gardens is what we have come to call April. The realignment of the calendar in 1582 emphasized this distinction, foreshadowing philosopher-scientist Alfred Korzybski's premise that "the map is not the territory."

[1] The Catholic Julian Calendar dates from the council of Nicaea in 325 CE.

[2] The authoritative reference on the full extent of the changes and the events leading to them is Coyne, Hoskin, Pedersen 1983. (See the 'bibliography' link to the right.)

*This post first appeared in a significantly different form on 23 September 2013.