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. 

 Fimctions, 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. 

 GiUs 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. 

 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 ; 



