INDEX 17 
References 
are to pages 
Gophers, harmful mammals 
134 
Guard cells, of stomata . 
285 
Government inspection, 
of 
Guide to amount of food 
429 
meat. 
177, 
495 
Gullet, of paramecium . . . 
147 
of oyster beds . . . 
193 
Gulls, sailing birds. . . . . 
108 
Grafting, effect of . . . 
377 
Gums, effect of tartar on 
407 
discussed. 
270 
Gunpowder, use of willow char¬ 
Grain, differs from bean . 
224 
coal for. 
352 
of corn, a form of fruit 
237 
Guttation, defined. 
284 
“ Grain ” of wood . . . 
266, 
355 
Gymnosperms, by-products of . 
346 
Grains (cereals) 
244 
classified. 
9 
Grantia, classified . . . 
8 
discussed. 
341 
described. 
155 
economic importance of . 
346 
Grape sugar. 
439 
economic value of ... 
346 
Grass family. 
295 
field study of. 
345 
compared with rose family 
376 
in coal beds. 
339 
Grass, monocotyledon 
227 
reason for name. 
344 
wind-pollinated flower . 
210 
student report on ... . 
346 
Grasses, adaptations of . 
288 
Gypsy moths, injurious insects 
importance of, as food . 
296, 
376 
39, 525 
in plant succession . 
375 
Grasshopper, classified 
. 9, 29 
H 
classification of. 
28 
described . . . . . 
17 
Habitat, of evergreens 
344 
hairworm in body of . 
178 
of frogs. 
83 
laboratory study of . 
20 
of mosses. 
328 
life history of . 
25 
of protozoa. 
142 
mouth parts of . 
22 
Habits, as to alcoholic bever¬ 
parts of. 
22 
ages . 
478 
representative animal . 
18 
of plants, of interest to farmer 
376 
structure of ... 
22 
Haemoglobin in corpuscles . 
449 
Gravity, influence of, on roots . 
250 
Hair, origin of. 
459 
Gray substance of nerves 
468 
Hair snakes. 
177 
Great northern shrike, winter 
Hair worm. 
177 
visitant. 
112 
Hairs on leaves of Venus’s fly¬ 
Green algae. 
304 
trap . 
367 
Green frogs, development of 
93 
Hard maple as shade tree 
364 
Green glands of crayfish . 
63 
Hard palate. 
406 
Green manure .... 
257 
Hard wood of maple .... 
352 
Green manuring . . . 
257 
Harmful bacteria. 
309 
Green pea,s as food . . 
222 
Harvestman, harmless arach¬ 
Green turtles .... 
100 
nid . 
66 
Greyfish . 
80 
Haustoria, modified roots . . 
253 
Gristle, defined .... 
433 
Hawk, Cooper’s, harmful . . 
115 
Grosbeaks, beak of 
109 
example of bird. 
9 
Ground birds, wings of . 
108 
marsh. 
115 
Ground squirrels 
526 
red-shouldered. 
115 
Grouse . 
117 
red-tailed. 
115 
Growth of bean embryo . 
220 
sharp-shinned. 
115 
of nervous system . 
468 
Hawks, beneficial birds among 
115 
of stems. 
265 
claws of . ... ^ . . 
108 
Grubs, larvae of beetles . 
28 1 
Hawkweed, a common weed 
301 
