652 



INDEX 



Ear, 361-S62 

 Ear drum, 362 

 Early cleavage, 417, 418 

 Earthworm, 67, 93, 103, 187-197, 188, 

 334, 335, 409, 507 



circulatory system of, 190, 191 



cross section of, 193 



development of, 197 



digestive tract of, 189 



"hearts" of, 190, 191 



hermaphroditic, 195 



nephridium of, 192 



nervous system of, 194, 195 



reactions to stimuli, 194 



regeneration in, 198 

 East, Dr. E. M., 465 

 Echinodermata, 95, 103, 335, 343 

 Echinoidea, 95 



Ecological balance, man's effect on, 577 

 Ecology 



definition of, 1, 26 



how to study, 4, 5 



typical region, 2-4 

 Economic value of plants and animals, 



573-579 

 Ectoderm, 419 



Hydra, 180-/Si 

 Ectodermal cells, 343 

 Ectodermal derivatives, 422 

 Ectoparasites, 219 

 Ectoplasm 



Ameba, 154 



Paramecium, 158, 159 

 Eddy, 278 

 Edentata, 115 

 Education, 437 

 Eels, 499 



Effector, definition of, 375 

 Effector cell, 341 

 Effector neurons, 376 

 Efferent fibers 



bee, 211 



earthworm, 195 

 Egg shells, 422-423 

 Eggs, 490, 503 



care of, by parents, 46 



theories regarding, in heredity, 466 

 Egyptians, 561 

 Eijkman, 278 

 Einstein, 520 

 Elasmobranchii, 107 

 Elbow, 332 



Elements, in tissues, 277 

 Elephant, 117, 545 

 Elephant-fishes, 107 

 Elephants and ancestors, range of, SI 

 Elephas, 556 



Elimination of the unfit, 521 

 Elk, 527 



Elliot, Dr. D. G., 535 



Elton, 215 



Embiidina, 100 



Embryonic membranes, 4^4-4^6, 4^7 



Embryology, 500 



Embryo sac, 177 



Emotional responses, 383-384 



Emus, 113 



Enamel, 286 



Endameba histolytica, 225, 422 



Endoderm, 281, 419 



formation of, in earthworm, 197 



Hydra, 181, 182 

 Endodermal derivatives, 422 

 Endomixis, 161, 417 

 Endoplasm 



Ameba, 154 



Paramecium, 158, 159 

 End organs, 340 

 Endoskeleton, 235, 328, 329, 334, 336, 



532 

 Endothelial muscle cells in Hydra, 181 

 Endothelium, 304 

 Endotoxins, 621 

 Energy 



non-producers of, 276 



producers of, 276 



release in plants, 237 

 Engelmann, experiment of, with oxygen 



release in algae, 258 

 English, 561, 562 

 Enterokinase, 297 

 Environment, 431 



basic, 7 



factors of, 7-20 



effect of, in heredity, 435, 437, 517, 

 522 



effect on diseases, 611-612 



man's effect on, 568-569 

 Enzymes, 279, 280, 396 



inverting, 297 



production of, 127-128 



reversible, 280 



types of, in plants, 263-264 

 Eoanthropus, 556, 560 

 Eocene period, 476, 510, 511, 513 

 Eohippus, 510, 511 



Eolithic division of Stone age, 547, 560 

 Ephemerida, 100 

 Ephippium, 413 

 Epicanthic fold, 563 

 Epidella melleni, 223 

 Epigenesis, 431 

 Epiglottis, 290 

 Epimere, 425 

 Epinephrine, 393 

 Epipharynx, bee, 204 

 Epiphytes, 23, 24 

 Epithelial cells, 291 



