530 



INDEX 



RANA, grafted tadpoles of, 341, 



S4i 

 Reactions, of germ cells, 43, 49 



machine-like, 465 

 REASON, 59-66 

 Reception cone, 109, 110 

 Recessive characters, 228 



"extracted," 230 



ratio to dominant, 233 

 Reduction of chromosomes, 136 

 REFLEXES, 52-56 

 Regeneration, in eggs and 



adults, 318, 321 

 Reproduction, 12, 36 

 Responses, varied, 68 

 Responsibility, 443, 445, 459 



definition of, 467 



of society, 469, 470, 482 



varied, 468, 469 

 Retinal degeneration, 295 

 RETZIUS, human spermatozoa, 



11, 14 



Reversible changes not in- 

 herited, 350 

 Reversion, 209, 223 

 Rickets, not inherited, 338, 340 

 Rigidity of behavior, 71 

 RIGNANO, "Centre - epigenesis" 



theory, 347, 495 

 ROMANES, 369, 370, 495 



cattle, 374 



fowls, 371, 872 



swine, 373 



ROME, decay of, 485, 486 

 ROSANOFF, insanity inherited, 



206, 500 



Rotifers, induction effect of I 

 alcohol, 349 



Salamanders, effects of colored 



soil on, 350 

 SALEEB\', 495 

 Savagery, 363, 396, 411 

 Scholars, prize, 415 

 SCHULTZE, double frog embryos, 



316 

 Science, duty of, 480 



Segregation, apparent lack of, 



280-287 

 fundamental to Mendelism, 



279 

 of Mendelian factors, 234, 



235, 251 



of substances in cells, 183 

 SELECTIVE BREEDING, only meth- 

 od of improving race, 

 404, 405 



Spartan method, 404 

 Self-control, 471, 475, 477, 478 

 "Self differentiation," 332, 333 

 Self discovery, 471, 475 

 SEMON, "Mneme" theory, 347, 



348, 495 



Sensitive periods, 310 

 SENSITIVITY', 48 



differential, 48, 52 

 general, 52 

 of germ cells, 49 

 Sex, a Mendelian character, 238, 



268, 269 



influence of food and tem- 

 perature, 303 



Sex cells, fundamentally alike, 

 13 



SEX DETERMINATION, 138-150 



in human embryo, 139 



in man, 145, 146, 147 



McCLUNG on, 141 



WILSON on, 141 



STEVENS on, 141 



Sex glands, effects on develop- 

 ment, 329-331 

 SEX-LIMITED INHERITANCE, 209y 



268, 270, 274 

 SEX-LINKED INHERITANCE, 209, 



270-278, 296 

 Sex ratio, modification of, 140, 



148-150 

 Sexual reproduction, value of, 



157, 416 



SHAW, BERNARD, 437 

 Sheep, cleavage of egg, 23 

 SHTJLL, heterozygosis, 384 

 500 



