The Medici letter, and both the Latin and Italian versions of the Soderini letter, are given by Varnhagen in his work on Vespucci.
There are forty-four words or expressions of Spanish or Portuguese origin in the Italian version,[34] which Vespucci must have got into the habit of using during his long residence in Spain, even when writing in his own language. Twelve of these refer to things belonging to the sea or ships,[35] an indication that Vespucci was ignorant of maritime affairs before he went to sea with Hojeda in 1499. But the Hispanicisms also show that the letter to Soderini was written by an Italian who had lived for several years among Spaniards. Vespucci answers to this description. He had been ten years in Spain or Portugal, or in Spanish or Portuguese ships, when he composed the letter to Soderini.
The feature in Vespucci's letters that has struck nearly all the students who have examined them, is their extraordinary vagueness. Not a single name of a commander is mentioned, and in the account of the two Spanish voyages there are not half-a-dozen names of places. The admirers of Vespucci explain this away by pointing out that he was corresponding with a friend, and only wrote what was likely to amuse him; and that he refers to a book he had written for fuller details. This might explain many omissions, but it is scarcely sufficient to account for the absolute silence respecting commanders and comrades, whom it would be as natural to mention as dates or the number of ships, and quite as entertaining. This extraordinary silence can really be accounted for only by the assumption that no real names could be made to fit into the facts as he gave them. This is, no doubt, the true explanation.
The "book" is referred to in four places in the Soderini letter, and once in the Medici letter. In one place Vespucci says: "In these four voyages I have seen so many things different from our customs that I have written a book to be called _The Four Voyages_, in which I have related the greater part of the things that I saw, very clearly and to the best of my ability. I have not yet published it, because my own affairs are in such a bad state that I have no taste for what I have written, yet I am inclined to publish it. In this work will be seen every event in detail, so I do not enlarge upon them here."[36] A little further on he says: "In each of my voyages I have noted down the most remarkable things, and all is reduced to a volume, in the geographical style, entitled _The Four Voyages_, in which all things are described in detail; but I have not yet sent out a copy, because it is necessary for me to revise it."[37] According to these two statements the book had been actually written, but not yet revised or shown to anyone. He also speaks of his observations of fixed stars as being in his _Four Voyages_.[38] But towards the end of the letter he says that he refrains from recounting certain events, because he reserves them for his _Four Voyages_; and in the Medici letter he speaks of "completing his work in consultation with learned persons and aided by friends, when he should return home."[39] From these passages the most probable conclusion is, that this book was never actually written, but that Vespucci intended to write such a work when he retired to Florence. He, however, never returned home. He went to Spain and obtained lucrative employment there, and the idea of writing a book was abandoned. He would not have dared to publish the story of his first voyage in a country where the truth was well known.