INDEX 



495 



tracheae, of grasshopper, 15 ; of spider, 

 114. 



tracks, of mammals, 4io-413. 



Trematoda, 185, 191. 



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. 

 Volwx, 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, 111-113. 



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. 



