706 - Index 



Edema, 335 balanced diet, 343-45; Second Law of, 185-86; 



Edentata, 676 solar, 185-86; transformations in the cell, 143- 



Effectors, 194, 431-45; cardiac muscle, 439-40; 49; transmitters in protoplasm, 89 



electric organs, 431, 441-42; galvano-, 441; Enterokinase, 312 



glands, 431, 440-41; luminescent organs. -131, Enteron, 283 



442-43; pigmentary, 431, 443-45; skeletal mus- Entropy, 143 



cles, 431-39; visceral, 465-67; visceral muscle, Environment, abiotic, 581-86; biotic, 573-81; 



439-40 geological changes in, 545, 546; land, adaptation 



Egestion, 128, 131 of plants to, 609-10; land and, plant nutrition, 



Egestive wastes. 131 238-39; limitations of, 541; organisms and, 573 



Egg cell, 19, 271-73; centrolecithal, 272; female Environmental variations, genetic vs., 513-17 



gamete, 57: fertilized (see Zygote); homole- Enzyme catalysis, 99-100; mechanism of, 105 



ci thai, 272, 277; sperm and, 59-60; telolecithal, Enzyme induction phenomena, 530-31 



272,277; types of, 272 Enzyme inhibition, 106 



Ejaculate, the, 381 Enzymes. 83. 129, 141. 301, 306, 312, 323, 442, 



Electrolytes, 73 506-07; action of, 104-08; catalytic potency of. 



Electron acceptor, 102 108-09; catalyzed reactions, reversibility of, 



Electron-hydrogen transmission, 1-16-49 107; cell structure in relation to, 107-08; chem- 



Elcctron microscope, II, 20, 21. 22, 23, 26, 27, ical nature of, 103-04; definition and example, 



3(1, 159 100-03; digestive, 102-03; hydrolytic, 28; im- 



Electrons, 70, Ml: planetary. 70 portance of, 100; intermolecular fit, concept of, 



Elephantiasis. 616, 647 106; master. 110-11; metabolic, 101-02; naming 



Elodea, 198 of, 100-01; representative, 101-03; sensitivity 



Embryo. 277; development of, 277-80; human, to hydrogen and other ions, 109; specificity of, 



392, 393, 558; implantation of, 388; nutrition 101, 108; substrate combinations, 104-06; tem- 



of, 388-93; plant, protection of. 610; seed plant perature in relation to, 109-10 



development, 230, 231; structure ol. in seed Ephedrin, 406 



plants, 222-24 Epicotyl. 223, 230 



Embryology, descriptive, 271; evolution and, 556- Epidermal tissues, 239, 241, 242-43 



57; experimental. 271. 531-36 Epidermis. 19, 22, 243, 246, 247, 248, 250 



Embryophyta, 609-21; Bryophyla, 610-11; Tra- Epididymis, 384, 385 



clieopliyla. 61 1-21 Epithelial cells. 19, 21, 48 



Emulsifying agents. 93 Epithelial tissues. 285-86 



Emulsions, 93; oil-in water, 93, 94; stable, 93; Epithelium, 292, 293, 387 



water -in-oil. 93, 94 Equilibrium, receptors of, 424-25 



Encephalitis. 627 n. Erjui.seturn, 614 



Endocrine glands, 383, 398-417; activities of, 413- Erectile tissue, 385-86 



17; adrenal glands, 406-08; ovary as organ of, Erythroblastosis fetalis, 326 



400-02; pancreas, function of, 108-09; para- Erythrocytes, 289-90, 320-21 



thyroid glands, 405-06; pituitary gland. -109-13; Erythropoietin, 413 



research methods, 399; testis as. 399-100; thy- Esophagus, 295, 296, 297. 303, 304 



roid gland, 402-05 Essential amino acids, 136. 137, 153. 346 



Endocrinology, cellular, 417; invertebrate, 414 Estrogen, 387 



Endoderm, 278, 281; formation of, 277-78 Estrous cycle, ovarian hormones and, 400 



Endodermis, 243, 216, 250 Ether, 117 



Endoparasites, 178 Ethyl alcohol, 152 



Endopeptidase, 306 Eudorina, 59, 61 



Endoplasmic reticulum, 7, 23-25 Euglena, 178. 592 



Endoskeleton, 661 Euglenophytes (Euglenoids), 596 



Endothelium, 328, 329 Eumycophytes (true fungi), 604-09; Ascomycetes, 



Energy, 132: atomic . 66; availability from differ- 604-06; Basidiomycetes, 606-07; Deutero- 



ent foods, 344-45; chemical, 66, 78; electrical, myceles, 607: lichens, 607-09; Phycomycetes, 



66, 185; electronic, 66; excitation, 1(32; First 604 



Law of, 185; forms of, 66; free, 143; kinetic. Eustachian tubes. 283, 303 



66, 71; matter and, 66-71; mechanical, 66, 185; Eutheria, 673, 674-75; orders of, 675-76 



molecular, 66: osmotic, 185; polymolecular, 66; Evolution, 538: biochemical relationships among 



potential, 66, 71; radiant, 66, 161; requirement, organisms, 557-59; classification, basis of, 553- 



