462 



INDEX 



Earthworm, 121-129, 159, 162, 

 415; body plan, 122; circula- 

 tory system, 122; dissection of, 

 123; excretion, 177; feeding 

 instinct, 342; nerve cells, 194; 

 nerve cord, 184; reflex arc, 184; 

 regeneration and grafting, 222; 

 reproductive organs, 204; sen- 

 sory and motor neurons, 184; 

 transverse section, 124 



Echinoderm, 259, 415 (see Sea 

 Urchin) 



Ecology, 4, 368 



Ectoderm, 22, 57, 119, 126, 185, 

 215 



Ectoplasm, 27, 40 



Education (see Man) 



Efferent nerve (see Nerve) 



Egg, 101, 104, 106, 112, 236, 253; 

 of Cat, 25; changes at fertiliza- 

 tion, 241; human, 239; Mam- 

 mal, 238, 239, 402; membrane, 

 241; organization of, 236, 254, 

 255 



Egyptian science, 379 



Elements, cycle of, 43, 46-50, 309 



Elephants, evolution of, 371; geo- 

 logical and geographical dis- 

 tribution, 370 , 



Elodea, 82 



Embryo, 112; Fish, Bird, Man, 

 205, 366 



Embryology, 4, 252, 364-366; 

 comparative, 402; of Earth- 

 worm, 125-129; experimental, 

 255, 403; history of, 401-403 



Embryo sac, 108, 112 



Empedocles, 406 



Emulsoid, 8 



Encyclopaedists, 384 



Endocrine, 312; glands, 159 (see 

 Thyroid and Chemical coordi- 

 nation) 



Endocrinology, 182 



Endoderm, 22, 57, 119, 126, 215 



Endomixis, 41, 247, 250; nuclear 

 changes, 248 



Endoplasm, 27, 40 



Endopodite, 132 



Endoskeleton, 140 (see Skeleton) 



Endosperm, 110, 111, 112 



Energy, conservation of, 396; 

 from sun, 37, 38; transforma- 

 tion of, 15, 38 (see Kinetic and 

 Potential energy) 



Enteric cavity, 57, 119 



Enteron, 22 



Environment, fitness of, 307; in- 

 fluence of, 266, 267, 296-298, 

 409 (see Adaptation) 



Enzymes, 14, 37, 156, 158, 310 



Eohippus, 361, 362 



Epencephalon, 188 (see Cerebel- 

 lum) 



Epidermis, 22; 60, 77, 79, 81, 139 



Epigenesis, 253, 257, 259, 401 



Epithelium, 156 



Epochs in biological history, 379- 

 411 



Equation division, 231, 232 



Equatorial plate, 225, 226, 242 



Equipotent, 258 



Equus (see Horse) 



Eristalis, 323 



Eugenics, 297 



Eustachian tube, 149, 150, 198, 

 356 



Euthenics, 297 



Evaporation, 89 



Evolution, 4, 129, 185, 251, 262, 

 267, 345-378; of Camel, 363; 

 of Elephant, 371; evidences 

 of, 347-372; factors of, 372- 

 378; and heredity, 376; of 

 Horse, 361, 362; history of, 

 406-411 



