PREFACE. xi 



The edition of the * Philosophie Zoologique ' referred 

 to in the following volume, is that edited by M. Chas. 

 Martins, Paris, Librairie F. Savy, 24, Kue de Haute- 

 feuille, 1873. 



The edition of the ' Origin of Species ' is that of 1876, 

 unless another edition be especially named. 



The italics throughout the book are generally mine, 

 except in the quotations from Miss Seward, where 

 they are all her own. 



I am anxious also to take the present opportunity 

 of acknowledging the obligations I am under to my 

 friend Mr. H. F. Jones, and to other friends (who will 

 not allow me to mention their names, lest more errors 

 should be discovered than they or I yet know of), for 

 the invaluable assistance they have given me while 

 this work was going through the press. If I am able 

 to let it go before the public with any comfort or peace 

 of mind, I owe it entirely to the carefulness of their 

 supervision. 



I am also greatly indebted to Mr. Garnett, of the 

 British Museum, for having called my attention to 

 many works and passages of which otherwise I should 

 have known nothing. 



March 31, 1879. 



