INDEX 
15 
References are to pages 
Flower, defined . . . . 
202 
Forestry, defined . . . . 
346 
Flower bud. 
198 
Forests, extent of, in U. S. . 
348 
Flowering plants . . . .. . 
295 
importance of .... 
347 
common families .... 
295 
patrolling. 
360 
summary of .. 
302 
proportion necessary . . 
348 
Flowerless plants, classification 
Formaldehyde, disinfectant. 
512 
of ... .. 
9 
a preservative .... 
314 
Flowers, home work . . 208, 
217 
gas. 
512 
of lilies. 
199 
Formalin, in milk .... 
428 
of nasturtium. 
198 
Formation of coal and peat . 
339 
wind-pollinated. 
210 
Forms of leaves .... 
277 
Flycatchers, eaters of larvae . 
43 
Fossils, described .... 
95 
food of. 
115 
shells of animals now extinct 
95 
Flying wings of grasshopper 
23 
Foul breath caused by bacteria 
407 
Foliage, rank-scented leaves of 
Fox sparrows, transients . 
112 
nightshade family 
301 
Fox terrier, comparison 
of 
Food, care of. 
497 
primitive horse with . 
128 
definition of. 
410 
Frecldes. 
504 
first plants to be cultivated 
Freezing, protection of bacteria 
for, list of. 
296 
from. 
311 
for reindeer in Arctics . . . 
330 
Fresh air, a condition for health 
447 
fungi, a source of ... 
324 
aid in curing consumption 
491 
necessary to keep one fit 440, 497 
Freshets, cause of ... 
348 
of animals, student report 
prevention of .... 
351 
on. 
411 
Fresh-water planarians . . 
175 
of bacteria. 
310 
Frog, bull, development of . 
93 
of clam. 
188 
central nervous system of 
88 
of frogs. 
84 
common. 
83 
of muscles. 
439 
description of. 
83 
of plants, study of ... . 
281 
eggs. 
90 
of snakes. 
101 
example of amphibians 
9 
of starfish — how taken . 
171 
enemies of. 
84 
storage. 228, 
, 229 
fangs of. 
101 
stored in cotyledons of bean . 
220 
food of. 
84 
Food and Drugs Act .... 
502 
green, development of . 
93 
Food-getting, by grasshopper . 
21 
habitat of. 
83 
by starfish. 
171 
internal organs of . . . 
85 
Foods . 
410 
laboratory study of . . . 
89, 83 
Food shortage. 
422 
leopard, description of . 
83 
Foodstuffs in bean. 
228 
reproduction of frog 
87, 90 
Food substitutes. 
421 
respiration of. 
84 
Food taking, of earthworm . 
180 
Fronds of pteris 
333 
Food vacuole of amoeba . 
144 
Fruit, defined. 
233 
Foot of clam. 
186 
flies. 
522 
Foot of moss sporophyte . 
330 
of bean . 
237 
Forage insect investigation 
525 
of pine. 
344 
Fore limbs of animals dis¬ 
of poppy. 
238 
cussed . 
126 
production in connection with 
Forest products. 
351 
storage roots .... 
256 
rangers, work of. 
358 
steps in development of . 
233 
Forest reserves. 
361 
use of, to plant . . . ■ . 
234 
