I got Isidore Geoffroy’s “Histoire Naturelle Générale,” which Mr. Darwin commends in the note on the second page of the historical sketch, as giving “an excellent history of opinion” upon the subject of evolution, and a full account of Buffon’s conclusions upon the same subject. This at least is what I supposed Mr. Darwin to mean. What he said was that Isidore Geoffroy gives an excellent history of opinion on the subject of the date of the first publication of Lamarck, and that in his work there is a full account of Buffon’s fluctuating conclusions upon _the same subject_. {31} But Mr. Darwin is a more than commonly puzzling writer. I read what M. Geoffroy had to say upon Buffon, and was surprised to find that, after all, according to M. Geoffroy, Buffon, and not Lamarck, was the founder of the theory of evolution. His name, as I have already said, was never mentioned in the first edition of the “Origin of Species.” M. Geoffroy goes into the accusations of having fluctuated in his opinions, which he tells us have been brought against Buffon, and comes to the conclusion that they are unjust, as any one else will do who turns to Buffon himself. Mr. Darwin, however, in the “brief but imperfect sketch,” catches at the accusation, and repeats it while saying nothing whatever about the defence. The following is still all he says: “The first author who in modern times has treated” evolution “in a scientific spirit was Buffon. But as his opinions fluctuated greatly at different periods, and as he does not enter on the causes or means of the transformation of species, I need not here enter on details.” On the next page, in the note last quoted, Mr. Darwin originally repeated the accusation of Buffon’s having been fluctuating in his opinions, and appeared to give it the imprimatur of Isidore Geoffroy’s approval; the fact being that Isidore Geoffroy only quoted the accusation in order to refute it; and though, I suppose, meaning well, did not make half the case he might have done, and abounds with misstatements. My readers will find this matter particularly dealt with in “Evolution, Old and New,” Chapter X.