376 



Primitive sex cells, 126, 148 



Principles of good breeding, violation 

 of, 295 



Propagation of worst, 295 



PROTENOR, sex differentiation in, 759 



Protoplasmic and Cellular Organiza- 

 tion, 6 



Psychical Anlagen, 36 



Psychical development, table of, 56 



PSYCHOLOGICAL CHARACTERS INHER- 

 ITED, 70 



PUNNETT, 83, 103, 104 



"Pure lines," 266-269 



Puritans and Cavaliers disappearing, 

 3ii 



Purity of germ cells, 88, 99 



PYTHAGORAS, on transmigration, 33 



Race amalgamation, 320 



extermination, 290 



improvement, 4, 292, 340, 343 



preservation, 340 

 Radium, disintegration of atom, 283 



influence on spermatozoa, 218 

 RANA, grafted tadpoles of, 241, 242 

 Reactions, of germ cells, 38, 42 



machine-like, 330 

 REASON, 45-49 

 Reception cone, 12, 136 

 Recessive characters, 84 



"extracted," 86 



ratio to dominant, 84, 88 

 Reduction of chromosomes, 155-157 

 REFLEXES, 39, 40, 42 

 Regeneration, in eggs and adults, 227 

 Reproduction, 8, 30 

 Responses, useful, 46 



varied, 50 

 Responsibility, 320, 331 



definition of, 331 



of society, 332, 339 



varied, 332 



Retinal degeneration, 119 

 RETZIUS, human spermatozoa, 9, u 

 Reversible changes not inherited, 247, 



266 



Reversion, 73, 266 

 RICHARDS, mitosis in Fundulus, 20 

 Rickets, not inherited, 239, 240 

 RIDDLE, Sex determination, 166 

 Rigidity of behavior, 51 

 RIGNANO, "Centro-epigenesis" theory, 

 245 



ROMANES, 260-265 



cattle, 265 



fowls, 262, 263 



pigeons, 260, 261 



swine, 264 



ROME, decay of, 338, 339 

 ROSANOFF, insanity inherited, 71 

 Rotifiers, induction effect of alcohol, 



246 

 ROUSSEAU, 214 



Salamanders, effects of colored soil 



on, 247 



Savagery, 256, 287 

 Scholars, prize, 299 

 SCHULTZE, double frog embryos, 223 

 Science, duty of, 337 

 Segregation, 99 



apparent lack of, 108-112 



unusual ratios, 108 



blending of color, 109 



blending of size, in 



fundamental to Mendelism, 107 



of Mendelian factors, 99, 107 



of substance in cells, 142, 206 

 SELECTIVE BREEDING, only method of 

 improving race, 292 



Spartan method, 292 

 Selection, value in Evolution, 266, 272 

 Selective Mating, 306 

 Self-knowledge and Self-control, 335, 



343 



"Self differentiation," 235 

 Self discovery, 335 

 SMITH, ADAM, 214 

 SEMON, "Mneme" theory, 245 

 Sensitive periods, 218 

 SENSITIVITY, 37 



differential, 37 



general, 38 



of embryo, 38 



of germ cells, 37 



Sex, a Mendelian character, 91, 164, 

 165 



influence of food and tempera- 

 ture, 167 

 Sex cells, fundamentally alike, 10 



SEX DETERMINATION, 162 



in human embryo, 166 

 in man, 162, 765 

 in Ascaris, 161 



