INDEX 



557 



skull cap of fossil man-like ape of 

 Java, 336. 



sleep, 434. 



sleeping sickness, 151. 



slugs, as food, 471. 



smallpox, 139, 151; see protozoa, 

 469. 



smell, sense of, 416. 



snails, as food, 471. 



snakes, false ideas about, 274; few 

 dangerous, 274, 276; poisonous, 

 276; treatment for bites, 276; use- 

 ful as insect destroyers, 481. 



sodium, 15, 17, 23. 



soil, formation of, 486; composition, 

 487; maintaining the, 487. 



solar plexus, 411. 



Spencer, Herbert, quoted, 328; ap- 

 plied Darwin's theories, 542. 



spermaries, in frog, 263. 



sperm nucleus, 113. 



sphinx moth, 207. 



spices, 454. 



spinal bulb (medulla), 410. 



spinal cord, 410. 



spore-bearing plants, 127; classifi- 

 cation of, 127; as food, 455. 



sponge, 155, 157, 234; value of, 468, 

 469. 



squid, use as fish bait, 471. 



stamens, 109, 113. 



starch-making, in leaves, 91; see 

 photosynthesis. 



steapsin, 374. 



stems, function of, 68; kinds of: 

 shortened, 70; creeping, climbing, 

 71; fleshy, 72; use as food, 454. 



Stejneger, Dr., 276. 



stickleback, 247. 



stigma, 109. 



stomach, of man, 363, 370. 



stomates, function of, 91. 



stone axe head, New Stone Age, 

 338. 



style, 109, 113. 



sugar-cane, 456. 



sulphur, 13, 15, 17, 531. 



swimmerets, 182. 



sympathetic system of nerve ganglia 



411. 

 syphilis, 137; see Ehrlich. 



tadpole, 267. 



tanning materials, from plants, 461. 



tapeworm, 164-166. 



tar, 461. 



taste, sense of, 416. 



tea, effects of, 511. 



teeth, decay, 137; structure, number 



and kinds of, 367, 368; vertical 



section of tooth, 367; care of, 429; 



hygiene, 432. 



tegumen (inner seed coat), 31, 38. 

 test, for oxygen, 10, 18; for proteids, 



20; for starch, 22; for grape sugar, 



22; for fats, 24. 

 testa, seed coat, 31, 44. 

 thistle, 121. 



thorax, of grasshopper, 196. 

 timber, uses of, 460; products, 498; 



structure, 503; quarter grain, 504. 

 tissue, 27, 30. 

 toad, habits of, 269. 

 tobacco, harmful effects of, 509-511. 

 tongue, of man, functions, 365-367. 

 tonsils, 365; infection of, 432. 

 touch, sense of, 415. 

 tracheae, 173; see arthropods, 193; 



in man, 365, 382, 384. 

 trichina, 167. 

 trachoma, 151. 

 tree toad (hyla), 270. 

 tuberculosis, 137; effect of on alcohol 



users, 519. 

 turgescence, the expansion of plant 



cells by water, 58, 59. 

 turpentine, from pine pitch, 461. 

 typhoid, fever, 137, 142; vaccination 



against, 441. 

 trypsin, 374. 



U 



ungulates (hoofed), 312. 

 urine, 403. 



