INDEX. 389- 



D. 



Darwin, Charles, on the relation of intelligence of ant3 to the size of their brains, 

 45 ; on movements of plants, 49-51 ; on intelligence of earthworms, 77 ; 

 on special senses of earthworms, 86-7 ; on birds dreaming, 149 ; on mis-' 

 taken instincts of humble-bees, 168; on mistaken instincts of an African 

 shrew-mouse, 169 ; on variability and natural selection of instincts, 178 ; 

 on inherited tricks of manner, 185-6 ; on inherited paces of the horse, 

 188 ; on tumbler and Abyssinian pigeons, 188-90 ; on instincts of 

 biscacha, 189-90 ; on inheritance of handwriting, 194 ; on wildness and 

 tameness in rabbits, horses, and ducks, 196, and in wild animals, 197 ; on 

 effects of crossing upon instincts, 198-9 ; on intelligent imitation by 

 animals, 220-2 ; on protrusion of lips by orang-outang, 225 ; on sheep 

 and cattle learning to avoid poisonous herbs, 227 ; on obliteration of 

 wild instincts under domestication, 231-2 ; on acquisition of domestic 

 instincts, 236-9 ; on bees eating moths, 245 ; on local variations of 

 instinct in birds, 245-6 ; on the hyaena not burrov\'ing in South Africa, 

 249 ; on specific variations of instinct as difficulties against the theory of 

 natural selection, 251 ; on parasitic habits of Molotlu-us, 251 ; on adaptive 

 structures developed by natural selection, 253-4 ; on evolution of 

 instinct, 263-5 ; on similar instincts of unallied animals, 273 ; on dis- 

 similar instincts of allied animals, 274 ; on trivial and useless instincts, 

 274^6 ; on instincts apparently detrimental, 276-82 ; on migration of 

 lemming, 282 ; on theoiy of migration, 287-97 ; on sense of direction, 

 290-3 ; on instincts of neuter insects, 297-9 ; on instincts of sphex, 

 299 and 303 ; on bees boring corollas of flowers, 220-1, 301-2 ; on instinct 

 of feigning death, 308 ; on instinct of feigning injury, 316-17 ; on 

 reason in a crab, 336 ; on emotions of earthworms, 344 ; on sexual 

 selection, 344-5. 



[For all references to matter now published in the Posthumous 

 Essay on Instinct, see Index to the Essay. The following are references 

 to all the quotations from, and allusions to, the unpublished MSS of 

 Mr. Darwin which occur in the pages of the present work.] 



On changes produced in instinct by abnormal individual expe- 

 rience, 115 ; on instinctive fear and ferocity in young animals as 

 directed against particular enemies or kinds of prey, 165 ; on mistaken 

 instincts of ants, 168 ; on instinct of a kitten modified by individual 

 experience, 172 ; on analogies between instincts in species and acquired 

 habits in individuals, 179-80 ; on diversity of disposition in birds, 182 ; 

 on hereditary tricks of manner displayed by a child, 185-6, and by a 

 terrier, 186 ; on peculiar dispositions and habits transmitted in croco- 

 diles, ducks, horses, and pigeons, 188-9 ; on automatic actions displayed 

 by idiots and by an idiotic dog, 193 ; on instinctive wildness and tame- 

 ness respectively displayed by the progeny of wild and tame horses, 

 rabbits, and ducks, 196 ; on efiects upon instinct of crossing, 199 ; on 

 intelligent modification of instinct in bees, 207 ; on wild ducks building 

 in trees, 211 ; on hive-bees sucking through holes made in corollas by 

 humble-bees, 220-1 ; on dogs learning modes of attack by experience 

 and imitation, 221 ; on birds of one species learning danger cries of 

 birds of another, 221-2 ; on a dog learning by imitation the habits of a 

 cat, and lambs and cattle learning to avoid poisonous herbs, 224 ; on 

 canaries reared in a felt nest afterwards constructing a normal nest, 226 ; 

 on the non-instinctive character of the drinking movements of chickens, 

 228-9 ; on the incorrigibly wild instincts of sundi'y wild animals when 



