INDEX 



6.-,:{ 



Epithelio-muscular cells in Hydra, 180 



Epitrichian, 488 



Equilibration, 361 



Equisetum, 75 



Equus, 510, 511 



Eras of time, 475 



Erect mosaic, 358 



Erepsin, 295, 297 



Ergosterol, 279 



Erosion 



areas of in the United States, 591 

 damage from, 590-592 



Erythrocytes, 303 



Eskimo, 561, 562 



Esophagus, 287, 288 

 earthworm, 189 



Ethnology, 559 



Eucalyptus, 239 



Eugenics, 638, 639, 642 

 Euglena, 77, 103, 281 

 eyespot of, 375 

 nutrition in, 157 

 reproduction in, 157 

 structure of, 156 

 Euplectella, 79 

 Euplotes, 335, 342, 343, 375 

 Eurion, 563 



European corn borer, range of, 584, 585 

 Euspongia, 79 

 Eustachian tubes, 287 

 Euthenics, 638-639 

 Eutheria, 115 

 Evaporation, effect of, on rise of water 



in plants, 269 

 Evening primroses, mutations in, 525 

 Evidence, scientific, of evolution, 495 

 Evolution, 493-529 

 Excretion, 319 

 Exoascus, 73 

 Exophthalmic goiter, 395 

 Exoskeletons, 235, 328, 334, 336, 532 

 Exotoxins, 621 

 Expiration, 318 

 Extensors, 327 

 External nares, 284 

 External respiration, 312, 313, 316 

 Extra-embryonic coelom, 426 

 Eye, physical adaptations in, 488, 492 

 Eye brush, bee, 207 



Facets, 358 



Factor hypothesis, 450 



Factors, hereditary, 450, 458 



complimentary, 452 



inhibiting, 452 



sex-linked, 452 



supplementary, 452 

 Factors of the environment 



biotic, 19-^0 



chemical, /5-16 



gravity, 16 



light, 11-\A 



molar agencies, 18-/9 



substratum, 17-18 



temperature, 9-11 



water, 7-9, 8 

 Falconiformes, 114 

 Fangs, 493 

 Fat metabolism, regulating principle 



of, 402 

 Fat synthesis in plants, 262 

 Fats, 276, 282 

 Fatigue, muscular, 339 

 Faunce, W. H. P., 638 

 Federal agencies, 603-604 

 Federal bird and game refuges, 601 

 Feet, adaptations of, 333 

 Female pronucleus, 417 

 Femur, 332 



insect, 206, 207 

 Ferns, 75, 498 

 Fertilization, 414, 416, 456 



definition of, 62 



earthworm, 196-197 



moss, 176 



results of, 417 

 Fibrin, 311 

 Fibrinogen, 311 

 Fibula, 332 

 Filicineae, 75 

 Fins, 498 

 Fire, use of, 550 

 First polar bodv, 430 

 Fish, 499, 501, 532, 547 



armored, 334 



heart of, 497 



physical adaptations in, 491 



rise of, 513 

 Fisheries, 595-596 



Bureau of, 604-605 

 Fission, 411 

 Flagella, 334 



bacteria, 165 

 Flame cells, 320 



Flatworms, 85, 103, 344, 485, 532 

 Flemings, 562 

 Fleas, 216 

 Flexors, 327 

 Flexures, 347 

 Flies, 102 

 Flints, 547, 548 

 Florissant shales, 511 

 Flower, function of, 272 

 Flowering plants, rise of, 513 

 Fluctuating variations, 57^* 

 Flukes, 85, 103, 219 

 Fluorine, 277 

 Follicular cells, 399 



