INDEX 



Animals, mind of, 113-136; ampu- 

 tating their own legs, 115-117; 

 lack of perception of the humor- 

 ous, 118-120; the play of, 120; 

 creatures of habit, 123, 124; can 

 be trainedbut cannot be educated, 

 124, 133; use of signals by, 129; 

 their tools a part of themselves, 

 130, 131 ; activities determined by 

 their organization, 138, 139; na- 

 ture of their intelligence, 139, 140; 

 wise in their own sphere and stu- 

 pid out of it, 141; strength of 

 their instincts, 142; food habits, 

 143, 144; adaptiveness, 146; auto- 

 matic actions of, 146-154; in- 

 stinct, not habit, the key to their 

 behavior, 155-174; habit in do- 

 mestic, 162; instinct in domestic, 

 164; laboratory experiments on 

 psychology of, 165-168, 175-200; 

 memory in, 169; tropisms in, 169, 

 170; lack of self -consciousness, 

 193; community of mind in, 197- 

 199; untaught wisdom of, 201- 

 211; influence of domestication 

 upon, 201; training of, 208; feed- 

 ing instincts, 262-265; their intel- 

 ligence below the level of con- 

 sciousness, 265-267. 



Ants, 203, 204, 283. 



Apes, gleams of reason in, 202. 



Barn, a study in a, 24, 93, 94, 223. 



Bats, 286. 



Bears, getting rid of traps, 117. 



Beaver, amputating its own leg, 115, 

 116. 



Bee. See Honey-bee. 



Bees, solitary, 205. 



Beetle, sacred, 205. 



Bergson, Henri, his "Creative Evo- 

 lution," 71-73, 91 note. 



Birds, relation of books to, 12; study 

 and love of, 12, 13; as a piece of 

 living nature, 13; interest in, 36; 



morning awakening, 43; second 

 and third nests, 149; reasons for 

 seeking vicinity of man, 149-151; 

 color and color-sense, 194-196; 

 musical sense, 196, 197; possible 

 telepathy, 197, 198; the mother 

 the main bread-winner, 226; dan- 

 gers to ground nests, 232; auto- 

 matic character of bird-song, 256- 

 261 ; origin of bird-song, 257;defect- 

 ive voices, 261 ; the male in nest- 

 building, 268, 269; the mother the 

 head of the family, 269. 



Blood, circulation of, 237. 



Bluebird (Sialia stoZis), behavior of 

 a pair whose nest had been re- 

 moved, 120-123; feeding young, 

 226; young killed by grubs, 270, 

 271. 



Bobolink (Dolichonyx oryzivorus) ; 

 193 ; song of, 258 ; a bird with a de- 

 fective voice, 261. 



Bob-white. See Quail. 



Body, the, structure of, 18-21. 



Books, 5, 6. 



Bumblebee, 83; an unfortunate, 

 234; wintering, 282, 283. 



Burroughs, John, looking back upon 

 his life, 1-14; in love with thia 

 world, 2; secluded life, 2, 3; never 

 a fighter, 4; things missed, 4-7; 

 education, 5; literary career, 5; 

 relation to books, 5, 6; and the sol- 

 dier's life, 7-10; and nature, 10- 

 14; and the other world, 14, 15; 

 satisfied with this world, 14, 15; 

 the lesson of his life, 23. 



Butcher-bird. See Shrike. 



Butterflies, in winter, 281, 282. 



Butterfly, monarch, 282. 



Butterfly, mourning-cloak, 281. 



Candelabra-tree, 203, 204. 

 Carlyle, Thomas, and evolution, 57, 



58. 

 Cat, stalking a chipmunk, 266, 267. 



