|“Roma,” Antonio Neri,|
from Tesoro del Mondo (Neri 1598–1600).
Other accounts say he "traveled all over Europe" and that he deceitfully posed as a "common assistant" in order to learn scientific secrets that he could not gain access to by other means.  One story I have heard making the rounds among glass workers is that Neri was chased to the "gates of Prague" by assassins. This is most likely confusion with a similar story about Venetian glassmakers leaving Murano without state permission to ply their craft elsewhere.
There are four cities that Neri is confirmed to have visited: Florence, the city of his birth; Pisa where he worked at the glass furnace run by Niccolò Sisti; Antwerp, where he spent about seven years visiting his friend Emmanuel Ximenes and in Mechelen, at the Hospital of Malines, where he wrote about pioneering medical treatments in a letter to a friend back in Florence.
In addition, there are other locations that are strongly hinted at in various writings. In his Treasure of the World manuscript, Neri has an allegorical depiction in the form of a simplistic map showing “The Ways to Rome.” It depicts the walled enclave of the Vatican (see illustration) with various paths representing different chemical routes to transmutation. If nothing else, this leaves the door open to a personal familiarity with the eternal city. In his glass book, L’Arte Vetraria, Neri mentions a number of specific locations in northern Italy, but perhaps none as authoritatively as Venice. He comments about the materials and techniques specific to the glassmakers on Murano. There is little doubt that Neri was exposed to Venetian glass workers in Florence, Pisa and Antwerp, so they provide a perfectly plausible source for his knowledge of their distinctive techniques. This would be a sufficient explanation, except that there is also a letter written by his friend Emmanuel Ximenes, detailing a route for Neri's visit to Antwerp; a route that runs through Venice. Below is the passage from a letter, dated 5 December 1602. The glassmaker would be delayed by illness, but the following year he did make the journey. While it seems a good bet that he followed Ximenes' instructions that is another detail in need of confirmation.
Anyway, the lack of peace in these countries prevents me from recommending them for you to come or not, but if you make up your mind to come, God willing, you will have the same fortunes as we have. Besides, after your arrival, is not a marriage indissoluble, having no other bond than mutual affection? If you decide to come I would recommend that you should go with the courier from Florence to Venice, arriving in Venice in time that you would be able to accompany the merchants who come to the fair held in Frankfurt at mid Lent; you will stay there the length of the fair for fifteen days, which will not displease you for having seen it. After that, you would go in the company of other merchants to Cologne and then with them or others, by land or sea to Holland, ending up at this city. This sea, however, is nothing more than rivers. I recently went by land to Basel and from there by water ending here. But for Your Lordship, who does not speak the German and Flemish languages, I would consider better the way that I say, with merchants from Venice to Frankfurt and then with others by water to arrive here. To this end, if you decide to come, upon giving me notice I will immediately send letters of recommendation to Venice to find a person who will help you to find company that must end up in Frankfurt and another for a friend in Frankfurt to get you started and perhaps it would be the same one with whom Guillelmo Reineri, servant of my brother Mr. Niccolò, came from here. Guillelmo usually goes to every fair by water up to Frankfurt, then back when it ends. He is close to me, a friend and very practical in his travels. This Renieri may give a report of the Frankfurt fair and also details of the voyage, as he made the outward journey for the fair last September. I shall send him a letter by means of my brother to give him the money on my account that would be necessary. But you should decide and advise me immediately, in order to go to Venice in time to find a group. I will wait for your decision, asking God to inspire the best . . . 
 “E fatto con prestezza fagotto, la mattina all'aprir della porta uscì el di Firenze e se n'andò in Inghilterra. Girò la Spagna, Olanda, Francia e Germania…” [He packed in haste and in the morning opened his door, left Florence, and went to England. He toured Spain, Holland, France and Germany…] Targioni-Tozzetti 189, p. 149.
 Neri 1608.
 See Rodwell 1870.
 Ximenes 1601–11, 5 December 1602.
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