INDEX 



427 



Environments, adaptations for 



different 251 



Erosion 230-235 



by glaciers 233 



by solution 232 



by water 231 



by wind 230,231 



use of knowledge on ... 234 



Evergreens 271, 272 



expiration 71 



Eye, and light intensities . 150-151 



defects 151 



like a camera .... 149, 150 



Eyes, care of 152-153 



Fainting, first aid 404 



Farming, dry 240 



Fatigue, dangers from . .391, 393 

 experiment to measure . . 388 



poisons 388, 393 



Fatalities, causes of .... 401 

 Feather, structure of .... 29 



Feet, flat 372, 373 



Feldspar 319 



Fermentation, by yeasts . . 335 



Fertilization 263,264 



Fibers, cotton 119 



flax 119 



linen 119 



silk 119 



wool .119 



Field trip 252,300 



Finger prints 360 



Fire, cause of 106 



making a 104 



worshipers 103 



First aid 402-407 



Fish, how they live .... 283 



Fishing 288 



Flame 49 



Flatworms 297 



Flower, fruit from . 260, 262, 264 



parts of 262, 263 



work of 263 



Food 375-382 



chewing 379 



eaten by animals .... 266 

 how does it get to the cells 



381-382 



how prepared for digestion . 379 

 how transported in body 375-377 

 made by green plants . . 261, 311 



tables 328-329 



values 327-330 



water as a 321 



Foods, body building . . . 312 

 how absorbed ., 379 



bulky 320 



energy producing . 308, 315-317 

 fuel .... 308, 309, 312, 315 



growth 312 



how to keep from spoiling . 339 

 in different countries . . . 307 



kinds of 312 



measuring energy of . . 329, 330 



minerals in 322, 323 



protective 308, 312, 317-320, 319 

 regulative . . 308, 317-320, 319 

 what cooking does to ... 339 

 where do they come from 309-311 

 why do they spoil . . . 333-338 



Food cycle 258 



Forests 290-293 



and wild life 288 



animals in 291 



insects harmful to .... 292 



mixed 290 



support life 291 



trees of 290, 291 



yellow pine 291 



Fossil fern 220 



fish 221 



tree 222 



Fossils, age of 222 



what are 220-221 



Franklin 166, 177 



Frogs 283 



life history of 284 



eggs of 283 



Fruits, as foods . . 310, 320, 321 



formation of ... 260, 262, 264 



Fuel value of food .... 332 



Fuels, supply energy .... 352 



Galaxy 206 



Galen 2 



Galileo 53,54,55 



Galvani 174,166 



Geysers 232-233 



Glands of control 387 



Granite 218,219 



Grasshoppers 274 



Green leaves, as food factories 261 

 Green plants, food making by 



parts of '259 



Green vegetables, importance 



of 315 



Greeks, as astronomers . .201, 202 

 Growing trees exert force . . 229 



Habits, formation of 7, 366, 390, 397 



Hair, care of 361-362 



shampooing 362 



