196 Index. 



Pedigree of exceptional white or black specimens of wild animals 



not really known, 82 



of the descent of mammals and birds from reptiles, 129 



Pedigrees only kept of a few privileged animals, 22 



of highly^bred animals, 45 



of pigeons employed by Darwin to make crosses not known 



to him, 64 

 Permanence of type may be held together with a clear conception 



of the arbitrariness of the distinction between species and 



varieties, 8 

 may be absolute even when there exists the power of 



producing fertile hybrids, 9 

 of breeds and separate characters ought to be ascertained 



directly, II 

 of organized forms ought to be presumed till the contrary is 



shown, 13, 17, 20, 92 



of colour in the horse, 34, 85 



of characters, the bearing of embryogeny upon, 97 



, relative, of types and their surroundings, 136 



Permanent forms, what cause hindered the recognition of, 3 



, what differences are, no rule known for determining, 7 



types of pheasant, 2 



, slight differences shown to be, 80 



strains of more than one colour in breeds of the horse, 85 



Pig, North European tame, its origin not known, 37 



~, solid-hoofed, etc., 38 



, feral, in South America, 38 



in Jamaica, 39 



, tame, in India, 39 



, the greyhound, 36 



Pigs, wild, allied to Sus indica, 36 



, differences between wild and tame, of Europe, 36 



Pigeon, the domestic, 58 



, supposed to be the'strong point of transmutationists, 58 



, races of, breed true under domestication, 58 



, six grounds for supposing to have descended from the 



rock dove, stated and examined, 59, ct set/. 



