16 



INDEX 



References are to pages 



Fishes, continued 



food-taking 108 



reproduction of 109 



respiration of 108 



scales of (fig.) 107 



special senses /)f 109 



with lungs 106 



Fish fry, young (fig.) .... Ill 



showing volk sac (fig.) 



Ill 



Fission, a form of cell division 49, 339 



Flaccid cells 273 



Flagellata, group of Protozoa . 53 



Flagellate protozoa (fig.) . . 52 

 Flat worms, classified . . 6, 70 



Flavor, improvement of . . . 311 



of butter 345,349 



Flavors caused by fermentation 345 



by bacteria 345 



Flax, family 329 



requires cultivation .... 329 

 useless parts of plant removed 



by bacteria 345 



Fleas, member of Siphonaptera 20 



Flesh-eating animals . . . 161 



Fleshy fruits 309 



Fleshy stalks for storage . . 294 



Fleshy stems for food storage . 285 



Flies, carriers of bacteria . . 347 



classified 6 



members of Diptera .... 20 



Flipper of seal 152 



Floods, cause of 385 



damage caused by 386 



prevention of 385 



Florida alligator (fig.) ... 133 



Flour, food elements in . . . 179 



Flower, of Columbine (fig.) . . 304 



of corn with pistils (fig.) . . 299 



of mallow (fig.) 331 



of mint (fig.) 303 



of sweet pea (fig.) 298 



violet, cleistogamous (fig.) . . 301 



Flower bud 289 



Flowering plants 323 



common families 323 



summary of 336 



Flowering sage, adaptations 



for insect pollination . . . 304 

 Flowerless plants, classifica- 

 tion of 7 



food 



Flowers, field and laboratory 

 study of 



of bean, organs 



wind-pollinated . . . 

 Flycatcher, great-crested 



of 



Flycatchers, eaters of larvae . 



food of 



Flying squirrel (fig.) .... 

 Fly pollinating wild carrot 



(fig-) 



Foliage, rank-scented leaves of 



nightshade family .... 



Food, a vital condition . . . 



care of 



definition of 



first plants to be cultivated for, 

 list of 



for reindeer in Arctics . . 361 



fungi a source of 



necessary to keep one fit . . 



of animals, student report on . 



of bacteria 



of clam 



of plants, study of 



of snakes 



of starfish — how taken . . . 



pecuniary value of 



storage — Canada ginger (fig.) 



stored in cotyledons of bean . 

 Food-getting by animals . . 



by grasshopper 



Foods 



Foodstuffs in bean .... 

 Food-taking of earthworm . . 



of starfish 



Food vacuole 



Foot of moss sporophyte . . 

 Foraminifera, one of the (fig.) 

 Forest fires, harming of soil by 

 Forest reserves . . 

 Forestry in Europe 

 Forests, extent of in U 



importance of . . 



patrolling .... 



proportion necessary 



tall trunks of pine in 

 Forked veins of fern (fig.) 

 Formaldehyde, a preservative 



gas 



302 

 260 

 305 



26 



31 



145 



152 



298 



334 

 314 

 240 

 169 



326 



, 366 

 354 

 240 

 171 

 344 



96 

 320 

 132 



73 



177 



291 



261 



2 



14 



1 



265 



84 



73 



48 

 366 



52 

 387 

 387 

 387 

 385 

 385 

 387 

 385 

 377 

 371 

 348 

 253 



