INDEX 



441 



Excurrent tree, 100. 

 Exercise, and health, 421 ; 



in hygiene, 427. 

 Exoskeleton, 222. 

 Expiration, 384. 

 Eye, coats of, 409 ; 



defects in, 410 ; 



human, 409 ; 



image formed in, 410 ; 



of crayfish, 223 ; 



of insect, 236. 



Facets, 236. 



Family, defined, 157. 



Fatigue, defined, 378. 



Fats, 24, 331. 



Fermentation, chemistry of, 172. 



Ferns, characteristics of, 155. 



Fertilization, 37, 155, 153. 



Fevers, 394. 



Fibrin, 367. 



Fibrinogen, 367. 



Fibrovascular bundles, 88 ; 



of a monocotyledon, 108; 



use of, 101. 

 Filament, 34. 

 Fisheries of world, 282. 

 Fishes, appendages of, 275 ; 



body of, 275 ; 



classification of, 283 ; 



migration of, 282 ; 



protection of, 283. 

 Fission, 30, 192. 

 Flatworms, 216. 

 Flower, color and odor of, 41 ; 



dimorphic, 49 ; 



fertilization of, 36 ; 



pistillate, 47, 68 ; 



relation to fruit, 65 ; 



staminate, 46, 47, 68 ; 



structure of, 34 ; 



trimorphic, 49. 

 Flowers, work of, 34. 

 Fly, foot of, 241 ; 



typhoid, 240, 260. 

 Food, 24 ; 



and dietaries, 330 ; 



and health, 420 ; 



discovery of value of, 332 ; 



economy, 337 ; 



Food, in hygiene, 425 ; 



laws, 343 ; 



necessity of, 405 ; 



storage in stem, 109 ; 



swallowing of, 357 ; 



vacuoles, 191, 193 ; 



values, 340, 341 ; 



waste in kitchen, 342 ; 



why we need, 330. 

 Food taking, in clams, 267 ; 



in crayfish, 223 ; 



in earthworm, 214 ; 



in fishes, 279 ; 



in hydra, 202 ; 



in insects, 235 ; 



in snakes, 295 ; 



in the starfish, 272 ; 



in turtles, 293 ; 



organs of, 206. 



Foods, absorbed into blood, 361, 

 362; 



adulterations in, 343 ; 



costs of various, 338 ; 



inorganic, 24, 331 ; 



in roots and stem, 110 ; 



organic, 23 ; 



values of, 335. 

 Foraminifera, 198. 

 Forest destruction, 139, 140. 

 Forest regions in United States, 



136. 



Forestry, 141. 

 Forests, protection of, 141 ; 



their uses and protection, 133. 

 Fowls, 309. 

 Frog, leopard, 285 ; 



study of, 285 ; 



tree, 291. 

 Frond, 154. 

 Fruit, 51. 

 Fruits, and then- uses, 51 ; 



economic value of, 57 ; 



garden, 63 ; 



orchard, 63. 

 Function, defined, 27. 

 Functions, of an animal, 27, 206 ; 



of parts of a plant, 26. 

 Fungi, 149; 



parasitic, 173, 174 ; 



saprophytic, 171, 172. 



