Index. 187 



Faunas, marine, of the planet towards the end of the Tertiary 



age, 161 



, Indian and Australian, 163, 164 



, of Celebes, 164 



, mammalian, of Australia, 165 



, of different countries, 167 



Felines, many small wild, breed with domestic cat, 31 



striped, 99 



Fells torquata, tame cats resembling, 31 



Female animals, their supposed preference for bright-coloured 



males would seem to have been acquired in the teeth of natural 



selection, 138, rests on no evidence, 138 



birds, 141 



rabbit, 56 



Feral cats in New Zealand, 32 



guinea-fowl in the West Indies, whence probably derived, 



71 



horses, supposed, may just as soon be truly wild, 32 



pigs, their various colours and characteristics, 38, 39 



, of Jamaica, 39 



rabbits of various colours in the Falkland islands, 55 



Fertile reproduction, the notion of, an element in the con- 

 ventional idea of species, etc., 6 



, of different breeds of pigeons, 60, 61 



Fiji islands, tree frogs in, 158 



Fish swarm as higher beings never do, 122 



Fittest, survival of the, cannot conceivably have anything to do 

 with the laws by which the formation of crystals is regulated, 

 108 



Fixing characters, Darwin on, 20 



Flemish cow, 41 



Fowl, black-red game, 69 



, other breeds of, 69 



, where crossed, exhibits black-red plumage, 70 



, not unfrequently "doctored " for exhibition, 70 



Fox, the black form of, 76 



, American and Old World forms of, 8 



