INDEX. 



Abnormally coloured males conjectured to be attractive to female 



animals, 141, et seq. 



Aborted organs, popular argument for evolutionism, 95, 96 

 ^Esthetic principles, choice of female animals not regulated by> 



141 



Africa, South, and tropical America, their relations, 162, 163 

 African pigs, 39 



Agassiz, maintained that man was created in nations, 2 

 Albinism, 81 



Alchemists, their views compared with those of evolutionists, 102 

 would have supposed that all crystals sprung from one 



crystal, 103 

 Allen, Grant, his attempt to account for sexual selection, its 



failure, 142, et seq. 

 America, South, 162 



, marine fauna of shores of South and Central, 156 



, North, 162, 163 



American polygenist school, 4 



wolf and fox, 8, 75, 76 



Analogies, harmonious, in animals and plants, 114, 115 



Ancon, breed of sheep, 52 



Animal forms, their specific unity commonly supposed to be 



proved by fertile interbreeding, 6 



N 



