Index 875 



Elytra, 829 {see also Beetles) 



Embolus, 487 



Embryo, 129, 130, 134, 137,* 138, 143, 

 147,* 185-198, 200-205, 206- 

 218, 296,* 382, 442-457 



Embryology, 24 {see also specific organ- 

 isms) 



of animals, 442-457 



of frog, 444-450, 445*-457* 



of man, 450-456 



of vertebrates, 442-457 



of whitefish, 64* 

 Embryonic disk (embryonic shield), 

 451,* 453 



seed leaf, 207 

 Embryophyta, 109-112, 129-149, 185- 



198, 200-205, 206-218 

 Empedocles, 801 

 Emulsoid, 78 

 Enamel, 464* 

 End organ, 495 



Endamoeba, 274, 532, 533,* 784 

 Endocardium, 478 



Endocrine glands, 495,* 506-513, 507,* 

 767-772 



hormones, 506-513, 507,* 767-772 

 Endocyst, 277* 

 Endoderm {see Entoderm) 

 Endodermis, 141,* 145,* 216, 220 

 Endometrium, 452, 514 

 Endoparasite (entoparasite), 658 

 Endoplasm, 39, 40,* 344, 345,* 349, 

 354* 



Endopodite, 320* 

 Endoskeleton, 423 

 Endosome, 358 



Endosperm, 143, 147,* 202, 204, 206- 

 208, 210 



Endospore, 121,* 122, 167, 172 



Endostyle, 328* 



Energy, 79, 86, 87, 101, 105, 215, 229, 



751, 756, 759 

 Enterobius, 539, 661 

 Enterokinase, 476 

 Enteron, 286, 287,* 445* 

 Enteropneusta, 327 

 Entoderm, 280, 286, 286,* 288,* 291,* 



292, 293, 295, 299, 306, 309, 



314, 325, 368, 373, 445,* 



449,* 454 



Entomology {see Insects) 



Environment, 621, 625-645 



Enzymes, 91, 94, 101, 122, 171, 232, 



236, 344, 353, 360, 428-430, 



443, 668, 766 

 digestive, 344, 353, 360, 388, 476 

 Eohippus {see Horse) 

 Ephyra, 290* 

 Epicotyl, 147,* 202, 204, 213 



Epidermis, 141,* 145,* 147,* 368, 

 380,* 384, 459, 460* {see also 

 Tissues, epidermal) 

 Epididymis, 513, 514, 514* 

 Epigenesis, 830 

 Epiglottis, 469,* 492 

 Epimysium, 52,* 53 

 Epinephrine {see Endocrine glands) 

 Epipharynx, 410 

 Epiphysis, 509, 512 

 Epiphyte, 113, 114, 151, 152, 658, 669, 



670* 

 Epithehum, 283,* 284* {see also Tis- 



' sues, epithelial) 

 Equatorial plate, 63,* 65, 66,* 70 

 Equihbrium, 439, 496, 505 

 Equisetineae (horsetail), 110, 135, 194- 



195 

 Equisetum, 110, 137, 137,* 194, 195 

 Eras, 613-618 

 Ergosterol {see Vitamins) 

 Ergot, 252 



Erythrocyte {see Blood) 

 Esophagus, 296,* 299, 306,* 315,* 

 321,* 327,* 328,* 332,* 374,* 

 376, 381, 385,* 386, 394, 

 396,* 427,* 469,* 471,* 473 

 Estrin {see Endocrine glands) 

 Ethiopian region, 598 

 Eugenics, 526, 527, 715-718 

 Euglena, 274, 276,* 357-360, 358* 

 Eumycophyta, 109, 124-129, 124*- 128,* 



173-184 

 Eustachian, 427,* 439, 469,* 498,* 505 

 Evagination, 830 

 Evergreen, 200-204 

 Evolution (progressive development), 



24, 94, 729, 732-749 

 Excretion, 106 {see also specific organ- 

 isms) 

 Excretory pore, 369, 370, 376, 380,* 



381 

 Excurrent canal {see Sponges) 

 Exopodite, 320* 

 Exoskeleton, 314, 393, 400 {see also 



specific organisms) 

 Experimental cross, 673 



method, 22 

 Extraembryonic coelom, 831 

 Eye, 307,* 310,* 311,* 312,* 321,* 

 325,* 332,* 371, 421, 456,* 

 497, 497,* 505 

 brush, 401* 

 compound, 393, 394,* 403,* 406, 



410,* 411,* 412* 

 muscle, 438 

 simple (ocellus), 393, 394,* 396, 



397, 403* 

 spot (stigma), 156, 293, 301,* 308, 

 359, 370-372, 370* 



