Index 



163; influence upon development, 167, 

 169 



Eohippiis, 42, 48 



Epigenesis, 124 



Erosion, 20 



Ethics, evolution of, 464; relativity of, 462 



Eugenics, 225 



Eugenists, 361 



Eustachian tube, 130, 132 



Euthenics, 225 



Evening primrose, 183, 378, 380, 382, 387 



Evolution, III, 460; and adaptation, 62, 

 187; and continuity, 412; and discon- 

 tinuity, 419; and education, 441; and 

 ethics, 461; and heredity, 287; and 

 mechanism, 446; and natural selection, 

 452, 453; and progress, 188, 438, 439; 

 and religion, xiv, 297; and revolution, 

 397; and the ascent of man, 445; and 

 the Bible, 452; and variation, 193; as a 

 philosophy of change, 440, 441; as 

 dogma, xiv; as fact, xv, 398, 429, 439; 

 as historical study, 16; definition, 5, 15; 

 earlier use of word, 123; general theory 

 of, xii, chap. 9; organic, 13, 49, 72; 

 practical results of, 370; problems of, 

 163, 291, 292; theories of, 411, 429; 

 theory, general and special, 290 



Evolutionary thinking, 435 



Evolutionism, opposite of, 448, 449 

 Experimental method, spread of, 287 

 Explanations, mechanical and mental, 407 

 Extermination, non-selective, 360 



Fabre, Jean Henri Casimir (i 823-191 5), 

 366 



Factor in heredity, 250 



Fear, in relation to thinking, 449 



Fertilization, 254, 25 j, 272 



Fiske, John (1842-1901), 451 



Fitness, 61; of the environment, 147, 148; 

 origin of, 358; relativity of, 339, 459; 

 see adaptation 



Fluctuating variation, 163, 185, 191, 334 



Fluctuation in population, i 5 j 



Food-getting organs, 149 



Forces of nature, 408 



Form, as distinctive of living things, 55 



Fossils, 17, 32, 33, 34, 55, 66; and evolu- 

 tion, 30; and relative age, 28; forms, 

 141; human, 197, 198 



Four o'clock, Mirabilis jalapa, 237 



Franklin, Benjamin (1706-1790), 330 



469 



Freedom of will, 448 

 Frog, development of, 125 

 Function precedes structure, 84 



Galilei, Galileo (1564-1642), 280, 465 

 Galton, Francis (1822— 1911), 293, 348, 



351, 3J2, 372, 374, 375 

 Gametes, 253, 256 

 Gemmules, 314 

 Gene, 268, 355, 389, 392, 393, 420; and 



mutations, 391, 392; — m.ut?t.ions, 403; 



theory of, 269, 294 

 Generation of animals, 124 

 Genetic affinity, chemical tests of, 115 

 Genetic study, 436 

 Genotype, 179, 181, 191, 241, 370 

 Genus, 64 

 Germ cells, and radium, 426; ripening of, 



253 

 Germ plasm, 310, 311, 313, 314, 315, 327, 



371; purity of, 322 

 Germ track, 312, 313 

 Germinal change, 163, 394 

 Gilbert, William (1544-1603), 434 

 Gill slits, 130, 132 

 Giraffe, 306 

 Glacier, 2j 



God created in man's image, 466 

 Goethe, Johann Wolfgang von (1749- 



1832), 282 

 Goiter and development, 212, 214 

 Graft, 176 

 Grafting, 321 

 Grand Canyon, 24 

 Greek speculation, xii 

 Gregory, William K. (1876- ), 202 



Growth, 56 

 Gudernatsch, J. Friedrich (1880— ), 



173 

 Gulick, John T. (1832-1923), 360 

 Guyer, Michael F. (1874- ), 325, 326 



Haeckel, Ernst (1834-1919), 140, 142, 



288, 423, 424, 450 

 Hemophilia, 319 

 Hagfish, 35 

 Hair, loss of, in man and other animals, 



196 

 Harvey, William (1578-1667), 124, 125 

 Health as adaptation, 456 

 Heidelberg man, 197, 198 

 Heredity, 70, 142, 146; and environment, 



230, 317; and evolution, 230, 231; 



