INDEX 



425 



Frog, diagram of tongue, 242 ; 



food tube, 243 ; 



glands, 243 ; 



locomotion of, 241 ; 



long section, 243 ; 



metamorphosis, 245 ; 



nervous system, 352 ; 



sense organs, 242. 

 Fruit, a typical, 55. 

 Fruit of locust, 55. 

 Fruits and seeds as foods, 119. 

 Fruits, how scattered, 56. 

 Fuel, daily needs, 284. 

 Fuel values of nutrients, 277. 

 Functions, of all animals, 180 ; 



of an animal, 48 ; 



of bile, 307 ; 



of blood, 313 ; 



of cerebrum, 353 ; 



of colorless corpuscle, 316 ; 



of lymph, 317 ; 



of parts of plant, 48 ; 



of red corpuscle, 314. 

 Fungi, 130, 176; 



moldlike, 135; 



of our homes, 132. 

 Fur-bearing animals, 204. 



Gall bladder, 306 ; 



insects, 208. 

 Gallflies, 43. 

 Ganoids, 186, 187. 

 Garbage cans, 377. 

 Garden fruits, 123. 

 Gastric glands, 303 ; 



of frog, 243. 

 Gastric juice, 303. 

 Gastrula, 177, 178. 

 Genus, 175. 

 Geranium, 45. 

 German forest, 114. 

 Germ cells, 251. 

 Germination, of bean, 63 ; 



of pollen, 54. 

 Gills of fish, 234 ; 



rakers, 172, 234. 

 Glands, 297, 298, 299 ; 



gastric, 303 ; 



lymph, 324 ; 



Glands of frog, 243 ; 



salivary, 299. 

 Glomerulus, 341. 

 Glottis of frog, 243. 

 Glycogen, 307. 

 Gonorrhea, 156. 

 Grafting, 256. 

 Grains, 122. 



Grape sugar, test for, 68. 

 Gravity, influence on root, 72. 

 Green plants, economic value, 117 



give off oxygen, 95 ; 



harmful, 127; 



make starch, 90, 92. 

 Groups of plants, 174. 

 Guano, 82. 

 Guard cells, 88. 

 Gullet, 297, 300, 301, 302, 303 ; 



of frog, 243. 

 Gymnosperms, 176. 

 Gypsy moth, 215. 



Habits, 354. 



Habitat of protozoa, 172. 



Habit formation, 354. 



Haemoglobin, 314, 330. 



Hammer, 359. 



Hard palate, 301. 



Harm done by insects, 34, 225. 



Harmful green plants, 127 ; 



preservatives, 148. 

 Hay infusion, 163, 164. 

 Head of a bee, 38. 

 Heart a force pump, 320 ; 



diagram, 319 ; 



in action, 319 ; 



internal structure, 319 ; 



of fish, 236; 



size, position, 318. 

 Heat, and bacteria, 145 ; 



effect of, 22 ; 



output, 285. 

 Heating the house, 375. 

 Hemiptera, 32. 

 Hen's egg, 246. 

 Herbivorous animals, 213. . 

 Heredity, and evolution, 404 ; 



bearers of, 251 ; 



definition, 249 ; 



