INDEX 



405 



tracheae, of grasshopper, 15; of spider, 

 114. 



tracks, of mammals, 4io-413. 



Trematoda, 185, igi. 



trepang, 197. 



Trichina, 179, 180. 



trichocyst, 218, 219. 



trochanter, n. 



trout, 276, 285, 286, 289, 291, 295. 



Trypanosoma, 226, 228. 



tuberculosis, germs of, 74, 79. 



Tubifex, 176. 



tuna, 288. 



Turbellaria, 185, 191. 



turbot, 288. 



turkey, 369, 381. 



turtles, box, 316; egg laying of, 311; 

 fresh- water, 314; green, 317; habitat 

 of, 314; hawk's-bill, 317, 318; internal 

 organs of, 311; leathery, 319; musk, 

 313, 315 ; nervous system of, 311 ; sea, 

 317; sense organs of, 311; skeleton 

 of, 310; soft-shelled, 314, 315; ter- 

 restrial, 316; tortoise-shell, 317, 318. 



tympanum, of frog, 258, 261 ; of mam- 

 mal, 409. 



Tyndall, 244. 



typhoid fever, germs of, 74, 78. 



umbo, 146, 147. 



United States Department of Agricul- 

 ture, 480-481. 

 ureter, of frog, 252. 

 urine, 407. 

 Uroglena, 231, 232. 



vacuole, contractile, 220, 222, 223; food, 



219. 



valves, of mussel, 146, 148. 

 ventral nerve cord, of earthworm, 



172. 

 ventricle, of frog, 249; of mussel, 147, 



151 (see circulation), 

 ventriculus, 12, 14. 

 Venus, 156. 



Venus's flower basket, 217. 

 vertebral column, 254, 255. 

 Vertebrata, 7, 234-237. 

 viper, spreading, 325. 

 vireo, 349, 

 visual organs, 17 (see eye and sense 



organs) . 



vitreous body, 408. 

 vocal cords, 406. 

 Volvox, 231, 232. 

 Vorticella, 225. 

 vulture, 369. 



walkingstick, 30. 



walrus, 429, 430. 



wampum, 156. 



wapiti, 437-438, 452. 



warbler, 375, 380. 



warm-blooded animals, 252. 



warning coloration, 30. 



water, Influence on animals, 3, 417. 



water skater, 25. 



water vascular system, 194. 



wax, 63. 



weasel, 454, 455. 



web, of spider, 111113. 



weevil, alfalfa, 35, 36; bean, 39; cotton 

 boll, 35, 36; pea, 39. 



whales, 442-443. 



whippoorwill, 343, 355, 372. 



whitefish, 290, 291. 



wildcat, 106, 454. 



wings, of bird, 335 ; of grasshopper, 9-10. 



wolf, 424, 454. 



wolverine, 427-428. 



woodchuck, 414, 434. 



woodcock, 386, 387. 



woodpecker, 348, 356, 372, 380. 



wool, 400. 



worker honeybee, 63. 



worms, bag, 47; bladder, 189, 190; 

 bristle-footed, 177; cabbage, 38; 

 clam, 176; corn-ear, 35, 36; cut, 35, 

 36; duckweed, 176; fall web, 46, 47; 

 fresh-water, 176; hook, 179, 182; in- 

 testinal, 178; marine, 176; meal, 59, 

 60; nodular, 181, 182; parasitic, 80; 

 round, 178-182 ; sand, 176 ; silk, 62- 

 63; segmented, 7, 176; stomach, 181. 

 182. 



wren, 375, 394, 395. 



yaws, 80, 229. 



yellow fever mosquito, 93-97. 



zebra, 441. 

 zooid, 205. 



zoology, 6; civic, 6; practical, 471; 

 progress of, 472-481. 



Printed in the United States of America. 



