.546 



INDEX 



Plate, ancestors of German 

 Emperor, 223 

 factors for coat colors of 



mice, 265 

 Mendelian inheritance in 



man, 299-304 

 "Pseudo-heredity," 295 



Plato, on transmigration, 44, 



Polar bodies, 113, 144 



Polarity, 174, 175 



of Styela egg, 123, 125, 1Z8 



Pollen, 13 



Polydactylism, 205, 302 



Polyhybrid, 251 



Population, normally station- 

 ary, 447-450 

 of Europe, 449 



Poultry, selection for egg pro- 

 duction, 387 



Preformation, 84, 86, 167, 468 



Epigenesis, 88-90 



"Preinduction," in Daphnia, 358 



"Preinheritance," 295 



Prepotency, 229 



Presence and Absence Hy- 

 pothesis, 254-256 



Primitive sex cells, 100, 134 



Principles of good breeding, 

 violation of, 421 



Propagation of worst, 422 



Protenor, sex differentiation 

 in, US 



Protoplasm, 9 



Psychical Anlagen, 50 



Psychial development, table 

 of, 83 



Psychological characters in- 

 herited, 210-213 



Punnett, 231, 264 



"Pure lines,' 386, 388 



Puritans and Cavaliers disap- 

 pearing 450 



Purity of germ cells, 240, 257, 



Pythagoras, on transmigration, 

 44 



Race amalgamation, 413, 414 



extermination, 413 



improvement, 6, 500-507 



preservation, 500 

 Radium, disintegration of atom, 

 406, 407 



influence on spermatozoa, 

 319 

 Rana, grafted tadpoles of, 350, 



851 

 Reactions, of germ cells, 47, 50 



machine-like, 481 

 Reason, 65-72 

 Reception cone, 20, 116 

 Recessive characters, 234 



"extracted," 236 



ratio to dominant, 239 

 Reduction of chromosomes, 143 

 Reflexes, 56-64 

 Regeneration, in eggs and 



adults, 326, 329 

 Reproduction, 12, 39 

 Responses, varied, 73 

 Responsibility, 460, 475 



definition of, 483 



of society, 485, 498 



varied, 484, 485 

 Retinal degeneration, 303 

 Retzius, human spermatozoa, 



11, 14 

 Reversible changes not in- 

 herited 359 

 Reversion, 215, 229 

 Rickets, not inherited, 346 

 Riddle, Sex determination, 157 

 Rigidity of behavior, 76 

 Rignano, "Centro - epigenesis" 



theory, 356 

 Romanes, 377-382 



cattle, 882 



fowls, 379, 880 



swine, 381 

 Rome, decay of 501, 502 

 Rosanoff, insanitv inherited, 

 212 



