448 



INDEX 



Teeth, canine, 313 ; 



incisor, 314 ; 



kinds of, in man, 356. 

 Teleosts, 284. 

 Temperature, feeling of, 406 ; 



in germination, 76. 

 Tentacles, 202. 

 Thallophytes, 157. 

 Thallus, 144. 



Thallus plants, divisions of, 149. 

 Thoracic duct, 377. 

 Thorax, 234 ; 



in man, 327. 

 Timber, cutting of, 138. 

 Tissue, 28, 204, 322, 323. 

 Tissues of human body, 204. 

 Toad, common, 290. 

 Tobacco, effect on circulation, 381 ; 



effect on nervous system, 349 ; 



effect on respiration, 396 ; 



use of, 348. 

 Tongue, 354. 

 Tooth, section of, 355. 

 Tortoise, box, 294. 

 Touch, organs of, 406. 

 Tracheae, 235. 



Transpiration, in plants, 126, 127. 

 Tree, wounded by "cribbing," 142. 

 Trees, city's need for, 141. 

 Trilliums, 168. 

 Trypanosomes, 197. 

 Tuberculosis, 180; 



death rate from, 428, 429 ; 



fighting, 436. 

 Turtles, 293. 

 Tussock moth, 263, 264. 

 Typhoid fever, 181 ; 



due to milk supply, 434 ; 



due to water supply, 433 ; 



fighting, 434. 



Underwing moth, 250. 

 Ungulates, 315. 

 Urea, 393. 

 Ureter, 390, 391. 

 Urethra, 391. 

 Uropod, 224. 



Vaccination, 431. 



Vacuole, contractile, 191, 192, 193. 



Vacuole, food, 191, 193. 

 Veins, 370, 375. 

 Ventilation, need of, 386 ; 



of sleeping rooms, 388 ; 



proper, 386, 387. 

 Ventricle, 370. 

 Venus's flower basket, 207. 

 Venus's flytrap, 131. 

 Vermiform appendix, 363. 

 Vertebra, 326, 327. 

 Vertebral column, 326. 

 Vertebrates, compared with inver- 

 tebrates, 274. 

 Viceroy butterfly, 251. 

 Villus, structure of, 362. 

 Virginia deer, 315. 

 Vorticella, 195. 



Walking stick, 249. 

 Warning coloration, 251. 

 Wasp, solitary, 253. 

 Water, and health, 420 ; 



and typhoid, 433 ; 



composition of, 20 ; 



factor in germination, 75 ; 



in hygiene, 425 ; 



in living things, 23 ; 



necessity of pure, 432, 433. 

 Water storage, in leaves, 130 ; 



in roots and stems, 111. 

 Water supply, factor in modifica- 

 tion, 160 ; 



regulated by forests, 133. 

 Web, spiders', uses and forms, 246. 

 Weed, 26. 



Wheat, production of, 59. 

 Wheat rust, 174. 

 Wing, of moth, 237. 

 Wings, of grasshopper, 234. 

 Wood, structure of, 138 ; 



uses of, 137. 

 Worms, harmful, 216 ; 



study of adaptations, 212. 



Xerophytes, 160, 161. 



Yeast, 171, 172. 



Yellow fever, caused by mosquito, 

 259. 



Zygospore, formation of, 150. 



