596 



INDEX 



Eggs, 106, 107, 111, 112, 171-173, 178, 179, 181, 

 186-187, 189, 198, 214, 216, 225, 246, 257, 

 258, 263, 264, 270, 278, 281, 285, 287, 288, 

 290-293, 298, 311, 315, 341, 355, 356, 365- 

 368, 371, 375, 376, 378, 383, 385, 389, 403, 

 404, 411, 448, 483, 493, 530, 539 



Egyptians, medicine, 549 



Eimeria stiedae, 82 



Elasmobranchii, 334, 338 



Elasmobranchs, 338-343 



Elastic fibers, 99 



Electric eels, 505 



Electric organs, 341 



Electric rays, 341 



Electrical energy, 37, 430 



Electrolysis, 11 



Electrolytes, 11 



Electrons, 8 



Electrotropism, 55, 72 



Elements, 8, 18 



Elephantiasis, 181 



Elephants, 417, 421, 506, 523-525 



Elephas, 524 



Elimination, 32, 33, 36, 37 42, 65, 71, 102, 138, 

 159, 161, 168, 178, 196, 213, 233, 246, 298, 

 315, 323, 325, 399, 441-442, 465-466, 487, 488 



Elk, Irish, 523 



Elytra, 275 



Emaciation, 43 



Embryo, 106, 116, 132, 140, 149, 161, 167, 171, 

 173, 178, 198, 237, 258, 355, 356, 371, 376, 

 377, 419, 447-450, 519, 520 



Embryogeny, 116-123, 518 

 (See also Life history) 



Embryology, 5, 116, 447, 554 



Emotions, 464, 473 



Empedocles, 25, 516, 549 



Emu, 403, 506 



Emulsion, 11 



Enaema, 541 



Enamel, 98, 318, 348, 407, 408 



Encephalon, 328 



Encystment, 68, 489 



Endocrine glands, 366-367, 387, 431, 433, 464-465 



Endoderm (see Entoderm) 



Endolymphatic duct, 330, 331 



Endomixis, 76, 77 



Endoparasites, 497 



Endoplasm, 63, 64, 70, 86 



Endoskeleton, 316, 318, 437-438 



Endostyle, 311-314 



Endothelium, 441 



Energy, 14, 15, 37, 430, 452, 453, 464 

 conservation, 15 



Engine, and body, 453 



Engraver beetle, work, 285 



Enteron, 135, 138, 142, 143-145, 158, 165, 166, 

 171, 172, 177, 318 

 (See also Alimentary canal; Gastrovascular 

 cavity) 



Enteropneusta, 547 



Enterozoa, 128 



Entoderm, 119, 120, 122, 123, 127, 128, 135-137, 

 142, 155, 306, 307, 418, 419, 449 



Entomology, 5 



Entomostraca, 262, 263 

 Entozoic, 80 

 Entropy, 15 

 Enzymes, 13, 97 



(See also Digestive enzymes; Ferments) 

 Eocene period, 511 

 Eohippus, 525 

 Ephelota gemmipara, 86 

 Ephydatia fluviatilis, 129, 132 

 Ephyra, 149, 150 

 Epibole, 121, 371, 372, 449 

 Epidermis, 158, 164, 193, 210, 318, 359, 406, 436, 



437 

 Epigenesis, 554 

 Epiglottis, 408 

 Epigynum, 297 

 Epimere, 450 

 Epipharynx, 273 

 Epithelia, 96-98, 102, 122, 123, 130, 158, 159, 161, 



318, 324, 329, 369, 436, 437, 439 

 (See also Skin) 

 Epitheliomuscular cells, 136 

 Epizoic associations, 494 

 Equal cleavage, 116, 118, 140, 198, 315, 419, 448, 



449 

 Equatorial plate, 47 

 Equilibrium, sense, 256, 331, 341, 354, 369, 395, 



445 

 Erect posture, 422 

 Erector muscle of hair, 318 

 Esophageal pouch, 232 

 Esophagus, 195, 210,-212, 230, 232, 253, 254, 277, 



322, 336, 350, 393, 416 

 Esox lucius, scale, 347 

 Estivation, 374 

 Ethiopian region, 505, 506 

 Ethmoidal cells, 329 

 Eugenics, 540 

 Euglena, 79 

 Eunice viridis, 249 

 Euplectella, 129 



Eupomotus i/ibbosus, mouth, 352 

 Eurosta solidaginis, gall, 286 

 Eurypterids, 514 

 Eustachian tube, 329-331, 362 

 Eutheria, 411 



Evaporation, heat regulation, 456 

 Evening primroses, mutation, 522 

 Evolution, 5, 516-526 

 Evolutionary series, 523 



Excretion, 32, 33, 36, 131, 138, 168, 246, 465-466 

 Excretions, 36, 65, 71, 102, 133, 159, 439 

 Excretory system, 102, 103, 158, 159, 168, 175, 



176, 186, 189, 213, 231, 233, 254, 298, 315, 



324-327, 336, 351-352, 395, 441-442, 466, 



520 

 Excretory pore, 158, 166, 176 

 Excretory tubes, 158, 166 

 Excretory tubule, 159 

 Exoskeleton, 318, 364, 437, 438 

 Expiration, 35-37, 42, 71, 439 



(See also Respiration) 

 External gills, 372, 373, 440 

 Exteroceptors, 445 

 Extra digits, inheritance, 637 



