The extrinsic evidence which in urged in support of the claim to the discovery by Verrazzano is not of great amount.  It is certain, however, that if the letter upon which the claim is founded, be spurious and fictitious, as for the reasons assigned, it is considered to be, any extraneous evidence, must either partake of the same character, or have originated in some misconception or error.  What exists upon the subject consists principally of two pieces, which have only recently been regarded of any importance for this purpose, and in connection with which the others may be considered.

One of them is an anonymous paper entitled in full, “Discourse of a great sea-captain, a Frenchman of the town of Dieppe, as to the voyages made to the new land of the West Indies, called New France, from the 40 Degrees to the 47 Degrees under the Arctic pole, and concerning the land of Brazil, Guinea, the island of St. Lawrence and that of Sumatra,” the other is a map of the world, bearing the name of Hieronimo de Verrazzano.

The discourse of the French captain does not, any more than the letter of Verrazzano, exist in the original; nor has any copy of it ever been produced, except in a printed translation by Ramusio in the same volume, as that in which his version of that letter appears, and immediately following it.  Ramusio states that it was written in 1539, as may he inferred from the letter itself in its present form, and that he had translated it from the French, grieving much that he did not know the name of the author, because not giving it he seemed to do wrong to the memory of so valiant and noble a gentleman.  It is evident, however, upon comparing the description, which it gives, of a voyage made from Dieppe to Sumatra, with the original journal, first brought to light and published a few years ago, of such a voyage made by Jean Parmentier in 1529, that this discourse was written by some one of the persons engaged in that expedition.[Footnote:  Voyages et decouvertes des navigateurs Normands.  Par L. Estancelin, p. 241. (Paris 1832.) M. Estancelin supposes that Pierre Mauclere the astronomer of one of the ships composing the expedition of Parmentier, was the author of this discourse (p. 45, note).  But M. D’Avezac attributes it to Pierre Crignon, who also accompanied Parmentier, and who besides being the editor of a collection of poems by Parmentier, after his death, evinced his knowledge of nautical matters by writing a dissertation on the variation of the needle.  Introduction to the Brief Recit of Jacques Cartier, p.  Vil (Tross, Paris, 1868.) Brunet, sub Parmentier.  Margry, Les navigateurs Francaises, p. 199. ] Its authenticity, in general, may therefore not be questioned.  But as the original has never been produced and it is only known through this version of Ramusio, experience in regard to his practice as a compiler, of altering texts according to his judgment of their defects and errors, proves that we have by no means a reliable copy for our guidance.  In fact, as given by Ramusio, its recognition of the Verrazzano discovery is only by way of parenthesis, and in such antagonism to the context, as to render it quite certain that this portion of it is by another hand.