390 MENTAL EVOLUTION IN ANIMALS. 



domesticated, 232 ; on the stupidity of Chinese dogs, 233 ; on the arti- 

 ficially bred instincts of sheep-dogs, pointers, and retrievers, 235-7 ; on 

 the effects upon artiflcially bred instincts of crossing, 241 ; on structures 

 adapted to obsolete uses, 253-4 ; on the causes of the evolution of 

 instinct, 2-64 ; on insects flying into flame, 278-80 ; on the instinct of 

 feigning injury as exhibited by the duck, partridge, &c., 316-17. 



Darwin, Dr. E., on mistaken instinct of Musca carnaria, 167; on a cat 

 imitating a dog, 224 ; on effects of domestication on instincts, 229 ; on 

 bees ceasing to collect honey in California, 245 ; on rabbits not bur- 

 rowing in Sor, 248. 



Darwin, Francis, on bees boring holes in corollas of flowers, 302. 



Daphnea pulex, colour-sense of, 98. 



Davis, on instincts of the processional caterpillar, 342-3. 



Davy, Sir H., on an eagle teaching young to fly, 227. 



Death, feigning of, by animals, 303-16. 



Death-watch, feigning death, 309. 



Deceit, in animals, 341, 347. 



Delusions, in animals, 149-50. 



Diagram, explanation of the, 63-9. 



Dilemma-time in perception, 134-5. 



DioTKsa, discrimination shown by, 50-1. 



Direction, sense of, 289-94. 



Discrimination, in relation to choice, 47-62 ; shown by vegetable tissues, 49- 

 51 ; by protoplasmic organisms, 51. 



Disposition, individual, of men and animals, 182. 



Dog, sense of smell in the, 93 ; sense of musical pitch in the, 94 ; imagina- 

 tion in the, 146 and 148-9 ; homesickness and pining of the, as proof of 

 imagination, 151-2 ; appreciation of cause by the, 155-8 ; instinct of 

 collie barking round a carriage, 182 ; attachment of the to other animals, 

 184 ; inherited antipathy of a, to butchers, 187 ; useless instincts of the, 

 176, 190 ; instinct of, in turning round to make a bed, 193 ; hereditary 

 transmission of begging in breeds of the, 195-6 ; effects of crossing upon 

 instincts of the, 198; learning by imitation, 221, 223-4; teaching 

 young, 227 ; influence of domestication ujDon psychology of the, 231-42 ; 

 barking of the, 249-55; sense of direction in the, 289-90; inability of 

 the, to appreciate mechanism, 351 ; grade of mental evolution of the, 352. 



Domestication, effects of, upon instinct, 230-42. 



Donders, Professor, on reaction-times in perception, 132, 135. 



Donovan, on cattle sucking bones, 247. 



Dragon-flies, migrations of, 286. 



Dreaming, in animals, 148-9. 



Drosera, discrimination shown by tentacles of, 49-50. 



Duck, sense of touch in the, 92 ; instincts of the young, 171, 196 ; a breed of 

 _sho\ving fear of water, 188 ; natural wildness and tameness of the, 196 ; 

 instincts of the, modified by crossing, 199 ; conveying young, 211 ; build- 

 ing on trees, 211 ; instinct of the, in feigning injury, 316. 



Dudgeon, P., on a cat rearing rats, 218. 



Dujardin, on relation of intelligence of ants to size of peduncular bodies, 46. 



Duncan, on spiders feigning death, 309. 



Duncan, Professor P. M., on instinct of Odynerus, 191-2. 



E. 



Eagle, variation in nest-building of the, 182 ; teaching young to fly, 227 ; teach- 

 ing a goose to eat flesh, 227. 



