INDEX 



plays inside the cosmic intelli- 

 gence, 145; and his instincts, 158- 

 161; his organization not special- 

 ized, 159, 160, 204; his superior- 

 ity to the higher mammals, 178, 

 179; has to learn what to eat, 262- 

 265. 



Mayer, A. G., 195. 



Mechanism vs. vitalism, 55, 56. 



Memory, in animals, 169. 



Mice, wood, 113. 



Mind, the animal, 113-136; in na- 

 ture, 124-128, 145, 206, 207. 



Mink, killing rabbits, 274-276. 



Monkeys, using tools, 114, 115, 129, 

 130; perception of the humorous, 

 120; monkey and puzzle-box, 176; 

 color-sense, 196; instinct in eating 

 eggs, 210, 211. 



Moth, promethea, 195. 



Mountains, age of, 37, 38. - 



Mouse, jumping, or kangaroo 

 mouse, 287, 288. 



Mouse, meadow, 287. 



Mouse, shrew, 287. 



Mouse, white-footed, 153, 287. 



Murres, in Bering Sea, 164. 



Muskrat, 286. 



Nature, the book of, 13, 14; hit-and- 

 miss method of, 76-92; blind, 

 groping intelligence of, 77; su- 

 periority over man, 85, 86; the 

 balancing of her books, 86; has no 

 need of eyes, 88; mind in, 124- 

 128; "trial and error" methods 

 of, 125, 126; relation to the ani- 

 mals and to man, 128, 129; her 

 thinking, 139-154. 



Nervous system, 169. 



Night, 22, 23. 



Nuts, the natural planting of, 85. 



Observation, vs. laboratory experi- 

 mentation, 165-168, 175-200; in- 

 tensive, 236. 



Oriole, Baltimore (Icterus galbula), 

 nests of, 147, 148, 150; nest-build- 

 ing, 269, 271, 272. 



Phcebe (Sayornis phoebe), 150; nest- 

 ing, 97, 98; fly-catching, 98, 99, 



228; plural nests, 141, 142 j and a 

 pair of barn swallows, ''223; se- 

 crecy about nest, 225; young in 

 nest, 225; homeliness, 225; young 

 leaving nest, 231; repeating call, 

 259. 



Phonograph, the, 171. 



Pika, haymaking, 144. 



Planetary systems, evolution of, 81. 



Plants, and seed-ripening, 149, 207; 

 intelligence of, 181, 203, 204, 266; 

 adapting means to an end, 265. 



Play, in animals, 120. 



Poetry, and science, 61-63. 



Prairie, the, 36, 37. 



Quail, or bob-white (Colinus virgini- 

 onus), 146. 



Rabbit, a timid, 96; and weasel, 

 274-281; can see behind, 274; noc- 

 turnal, 275; in winter, 286. 



Raccoon, 167, 168, 196, 211, 286. 



Rainbow, the, 212-216. 



Rat, stealing green peas, 96; and 

 weasel, 278, 279. 



Raven, northern (Corvus corax prin- 



*& cipalis), 43. 



Reason, origin of, 133-136; price 

 paid for, 136; and the power of 

 choice, 209-211. 



Reid, G. Archibald, his book "Tha 

 Laws of Heredity" quoted, 187. 



Robin (Planesticus migratorius), 

 143, 150, 268; plural nests, 141, 

 142; variation in number of eggs, 

 148; an odd nesting-site, 180; at- 

 tacked by a shrike, 290, 291. 



Roosevelt, Theodore, 164. 



Roosters, 193. 



Science, and the spiritual, 48-55; 

 limitations, 54, 55; occupied with 

 the physical side of things, 58- 

 62; no mystery to, 61; and poe- 

 try, 61-63; our debts to, 64-66; 

 and the evils of our civilization, 

 66-68; and some modern poets, 

 70, 71; in Bergson's "Creative 

 Evolution," 71-73; its influence 

 on modern life, 73-75. 



Sea-anemone, 202, 203. 



296 



