398 MENTAL EVOLUTION IN ANIMALS. 



Montaigne on dreaming in animals, 148. 



Morality, indefinite, and evolution of, 352. 



Morgan, Lewis H., on intelligence of the beaver, 329. 



Morgan, Professor Lloyd, on alleged instinct of the scorpion to commit 

 suicide, 278. 



Moseley, Professor H. N., on colour-sense of marine animals, 99 ; on imper- 

 fection of instinct in honey-sucking insects, 167 ; on beavers of Oregon 

 not constructing dams, 249 ; on migration of turtles, 28b'. 



Mouse feigning death, 306-7. 



Musca camaria, mistaken instinct of, 167. 



Muscles, coordination of, an index of nerve evolution, 38-44. 



Mysis, ear of, 87 ; colour-sense of, 98. 



Mysteriousness, sense of, in animals, 155-8. 



N. 



Natural selection. See Heredity. 



Nerve-tissue, structure and function of, 24-33. 



Neurility, 68. 



Newall, on carnivorous habits of wasps, 245. 



Newbury, Dr., on beavers not constructing dams, 249. 



Newton, Professor A., on attachments between birds of different species, 



185 ; on starlings imitating ducks, 222 ; on instincts of ring-plover, 246 ; 



on birds flying towards light, 279 ; on migration of birds, 286-7, 295. 

 Nidification, variations in instinct of, 182 ; supposed to be due to imitation, 



225-6 ; associated, 253 ; of Thrush and Hornbills, 255. 

 Nightingale, midnight singing of, inherited, 246. 

 Noulet, on nidification of swallows, 211. 

 Nuthatch, variation in nest-building of the, 182. 



o. 



Octopus, eye of, 88 ; olfactory sense in, 89 ; imagination in, 146 ; sense of 



colour in, 98-9. 

 Odynerus, instinct of, 171-2. 

 Offspring, recognition of, 349. 



Orang-outang, protrusion of lips by the, 225 ; intelligence of a, 328. 

 Oriole, Baltimore, improvement of nest-building of the, 210. 

 Orthoptera, ears of, 87. 

 Osmia aurulenta, 208. 

 Osmia bicolor, 208. 

 Ostrich, caponizing of the, 172. 



Owl, local variation of instinct of the, 210, 246; nidification of the, 210. 

 Oyster, memory in the, 121. 



P. 



Packard, on local variation of instinct in bees, 245. 

 Paget, Sir James, on a parrot learning to open a lock, 351. 

 Pains, 105-11. 

 Paley on direction of the external ear 93. 



