12 
INDEX 
References are to pages 
Earthworms — Continued 
Egg nucleus. 
209 
locomotion of. 
179 
Egg-plant, a food plant 
of 
respiration of. 
180 
nightshade family . 
301 
ventral surface. 
179 
a fruit. 
245 
Echinodermata, classified . . 
8 
Eggs, of frogs. 
91 
Echinoderms, discussed . . . 
169 
of grasshopper . 
25 
Economic importance, of algae . 
307 
of moss plant. 
329 
of amphibians. 
97 
Elder, use of flowers of . 
217 
of birds. 
114 
Elements and compounds 
12 
of ccelenterates. 
167 
Elm tree, roots of ... 
364 
of crustaceans. 
65 
wood, characteristics of . 
352 
of echinoderm group 
173 
Embryo, corn, position of 
225 
of earthworms. 
183 
growth of, in ovule . 
219 
of fern group. 
339 
heart of. 
480 
of flowers. 
216 
of coelenterate .... 
165 
of gymnosperms. 
346 
of coral . 
167 
of leaves. 
292 
of liver fluke. 
176 
• of lichens. 
326 
parts of. 
219 
of mammals. 
134 
sac, contents of . 
219 
of mollusks. 
192 
vigorous, result of cross-pol- 
of mosses. 
lination. 
211 
of paramecium. 
149 
Employment afforded by plant 
of plants. 
375 
industries. 
376 
of roots. 
255 
Enamel, effect of bacteria on 
407 
of seeds. 
222 
Encystment of amoeba 
145 
of sponges. 
157 
Endoderm, of sponge . 
155 
of starfish group. 
173 
Endoplasm. 
144 
Economic insects. 
29 
Endosperm, food supply 
of 
Economic interest in plants . 
375 
corn. 
225 
Economic phases of grasshopper 
29 
of corn grain. 
225 
Economic point of view in study 
of corn, used for growth 
of 
of plants. 
375 
seedling. 
227 
Economic value of mosses . 
330 
Enemies, of frog .... 
84 
Ectoderm, of sponge .... 
156 
of insects. 
34 
of hydra. 
160 
oflepidoptera .... 
41 
Edible clams, names of 
192 
of man. 
134,137 
Edible fats. 
14 
Energy, defined. 
10 
Edible mollusks, list of . . . 
192 
uses of in body .... 
418 
Edible pulp of plum, factor in 
English sparrow, destroys 
distribution. 
241 
weevils. 
35 
Eels, migrations of .... 
77 
eats larvae of Lepidoptera 
42 
Effect, of alcohol on digestion 
430 
permanent resident . 
111 
of drugs and alcohol 
456 
scientific name of . . . 
10 
Efferent fibers. 
470 
English walnut, protein in . 
410 
Efficiency centers of brain . 
481 
Enlarged base of onions, stor- 
Egg, a reproductive cell . . . 
153 
age of food in ... . 
286 
white of, example of protein 
416 
Enriching the soil by nitrogen . 
256 
Egg-capsule of earthworm . . 
182 
Environment, defined . . 
10 
Egg cell, of frogs. 
90 
discussed. 
536 
fertilization of, in plants . 
213 
illustrated by development of 
volvox. 
153 
frog. 
97 
