Fit EF ACE. Vll 



cation of Dr. Felder's " Voyage of tlie Novara" (Lepi- 

 doptera) in the interval between the reading of my 

 paper and its publication, several of my new species 

 must have their names changed for those given to 

 them by Dr. Felder, and this will explain the want of 

 agreement in some cases between the names used 

 in this volume and those of the original paper. 



V. ON INSTINCT IN MAN AND ANIMALS. 

 Not previously published. 



VI. THE PHILOSOPHY OF BIRDS' NESTS. 



First published in the " Intellectual Observer," July, 

 1867. Keprinted with considerable emendations and 

 additions. 



VII. A THEORY OF BIRDS' NESTS ; 



SHOWING THE RELATION OF CERTAIN DIFFERENCES OF 

 COLOUR IN BIRDS TO THEIR MODE OF NIDIFICATION. 



First published in the " Journal of Travel and Na- 

 tural History" (No. 2), 1868. Now reprinted with 

 considerable emendations and additions, by which I 

 have endeavoured more clearly to express, and more 

 fully to illustrate, my meaning in those parts which 

 have been misunderstood by my critics. 



VIII. CREATION BY LAW. 



First published in the " Quarterly Journal of 

 Science," October, 1867. Now reprinted with a few 

 alterations and additions. 



