ixi)i:x 



13 



Rqfen run b 



Ear, affected only by Bound . . 21 1 



balancing organ 218 



membrane of froj; Ill 



of grasshopper 11 



pistillate flower of corn . . . 298 



plan of (fig.) 218 



sense organ 216 



wax in L'ls 



Earthworm, economic impor- 

 tance of 84 



example of worms 6 



excretions of 83 



front end of nervous system of 



(fig.) 82 



illustration of true worms . . 80 



laboratory study of .... 82 



life history of 8.'5 



locomotion of 80 



limited environment of . . . 1<»'- 



organs of (fig.) 81 



respiration of 8ii 



ventral surface 80 



Easter lily (tig.) 300 



pollination of 307 



X-ray of (fig.) 327 



Echinoderms classified . . 6 

 Economic importance of am- 

 phibians 127 



of birds 114 



of coelenterates "<> 



of crustaceans 90 



of earthworms 84 



of fern group 374 



of gymnosperms 384 



of lichens 361 



of mammals 164 



of mollusks I'*" 



of paramoecium 61 



of plants 320 



of starfish group 74 



Economic insects 20 



Economic interest in plants . 4<mi 

 Economic phases of grass- 

 hopper 22 



Economic point of view in 



study of plants .... 320 



Economic value of mosses . 366 



Ectoderm, of sponge .... 59 



of hydra ,i:i 



Ectoplasm of sponge ... 1^ 



.//•.' /<> page* 



■ Edible clams, nam. •«, ..f . . . L0Q 

 Edible mollusks. Hal ..f . . . L00 

 Edible pulp of cherry, factor 

 in .list rihiit ion 



Eels, migrations of 1 1'» 



Efferent fibers 213 



Efficiency centers of 



brain 224,220 



Egg, a reproducl i\ <• cell ... i 



white of, example of protein 

 Egg-capsule of grasshopper 



(fig.) IS 



Egg cell (female parent) . . . 

 fertilization ..f. in plants . . 300 



Vblvoi (fig.) 06 



Egg-plant, a I i plant ..f night- 



Bhade family 



Eggs, of frog (fig.), develop- 

 ing 121, 122 



of grasshopper (fig.) .... L0 



of ladybug (fig.) 26 



of Land-locked salmon (fig. ) .110 



of moss plant 363 



Egyptians, use of beans by , . - ; 1T 

 Elbow, normal and broken, 



X-ray photograph (fig.) • ■ 180 



Elk (fig.) 150 



Elm. leaf (fig.) 



twig (fig.) 289 



Embryo, corn, position of • • 



growth of, in o\ ulr .... ■"■"! 



heart of 



Of clam (fig. ) . 91 



of coral 



of Liver flake "" 



parts of :; "i 



Bac, content a of 



vigorous, result of cross-polli- 

 nation 300 



Employment afforded by 



plant industries . . . . »oi 

 Enamel, effeel of bacteria on 167 

 Encystment of amoeba . . . 



Endoderm, of root 



of sponge 



Endoplasm 18 



Endosperm, food supply of corn 

 of corn uraiu 



of coin, used for growth oi 

 dling 



