438 



INDEX 



Frog, brain, 200 ; 



capillar}' circulation, 172 ; 



central nervous system, 200 ; 



digestive tract of, 147 ; 



metamorphosis, 230, 231 ; 



mouth of, 149, 150; 



sense organs, 110; 



tongue, 110. 

 Fruit, development, 41, 226; 



dispersal, 39, 40, 41. 

 Fruits, canned, 344; 



garden, 328; 



orchard, 329; 



value as food, 123, 124. 

 Fungi, 235, 236, 334-337. 

 Fur-bearing animals, conservation, 378. 

 Furs, 354, 355. 



Gall bladder, 156. 

 Gall insects, 357. 

 Gametes, 223. 

 Ganghon, 198. 

 Ganoid, Ganoidei, 245, 246. 

 Garbage, disposal of, 297, 306, 307. 

 Gas, for lighting, 294. 

 Gas gangrene, 266, 274. 

 Gastric glands, 153. 

 Gastric juice, 153, 154. 

 Gastrula, 227. 

 Gelatin, value as food, 121. 

 Generations, alternation of, 228. 

 Genus, in classification, 234. 

 Geotropism, 16, 67. 

 Geranium, "Lady Washington," pol- 

 lination, 37. 

 Germ cells, 381, 382, 383. 

 Germ diseases, 261-286. 

 German measles, 269. 

 Gill rakers, 244, 348. 

 Gills of a fish, 244. 

 Glanders, 271. 



Glands, digestive, 147, 148, 149, 153, 

 156, 157 ; 



ductless or endocrine, 166, 167 ; 



gastric, 153; 



intestinal, 157; 



lymph, 173, 174; 



salivary, 149. 

 Glomerulus, 188. 

 Glue, 355. 



Glycogen, 156, 168. 



Goat, 354. 



Goiter, 166. 



Grafting, propagation by, 221. 



Grape sugar, 59, 60. 



Grasshopper, 27; 



life history, 228, 229; 



mouth parts, 34. 

 Gravity, influence on living things, 16. 

 Green plants, 45 ; 



economic value, 84, 323-333 ; 



give off oxygen, 85-86 ; 



make food, 75-84 ; 



see also Plants. 

 Ground squirrels, 287. 

 Growth, method of, 15. 

 Gullet, 150, 152. 

 Gymnosperms, 237. 

 Gypsy moth, 363. 



Habits, 201; 



drink, 214; 



food, 134, 136; 



health, 212-214; 



how formed, 209-211; 



importance of, 210-211; 



in relation to a vocation, 402 ; 



rules for forming, 211-212. 

 Haemoglobin, 163, 178. 

 Hsemolysins, 166. 

 Harvey, WilHam, biologist, 406. 

 Havana, yellow fever in, 282. 

 Hay fever, 276. 

 Hay infusion, 97. 

 Headache powders, 144. 

 Health, 253 ; 



and clothing, 187 ; 



and exercise, 186. 

 Hearing, sense of, 203, 204. 

 Heart, 169, 170 ; 



of a fish, 245. 

 Heating, methods of, 294. 

 Heliotropism, 16. 

 Hemiptera, 27, 242. 

 Hemp, 330. 

 Hen's egg, 231, 232. 

 Heredity, 380, 381 ; 



of man, 396-401 ; 



transmitted by chromosomes, 381" 

 383, 396 ; 



