Index- 



357 



Spermatocytes, 148 

 MATURATION PERIOD, 154 



Orthogenesis, 207 



OSBORN, Cartwright Lectures, 272 



Otosclerosis, 69, 118 



Ovaries, transplanted, 231, 234 



OVIPARITY, 26 



Oviparous development, 13 



Ovules, 10 



Oxychromatin, differential distribu- 

 tion, 201 

 in cell body, 199 



"Pangenes" of deVries, 129, 199 

 Pangenesis, hypothesis of, 124, 227 

 Panmerism, 128 

 PARAMECIUM, avoiding reaction 48 



behavior of, 46 



reactions to heat and cold, 40 



races differing in size, 67 



races of, 66 



rapid breeding of, 115 



selection in, 255 



trial and error, 47 

 Parthenogenesis, 134 

 "Particulate" inheritance, 73 

 Partition walls between cells, 201 

 PASTEUR, 317 

 PATHOLOGICAL CHARACTERS INHERITED, 



69 



PEARL, action of selection, 255 

 PEARL AND PARS H LEY, modification 



of sex ratio, 165 

 PEARSON, ancestral inheritance, 77 



inheritance of tuberculosis, 69 



statistics, fault of, 80 

 Peas, Mendel's experiments on, 82 



monohybrids, 90, 91 



dihybrids, 91, 92 



trihybrids, 93, 95 



Permutations in distribution of chro- 

 mosomes, 171, 172 



Personality, determined by heredity, 

 303, 306, 309 



development of, 5, 56, 308 



infinity of chances in, 288 



not predetermined, 310 



potential, 316 



prediction impossible, 288 

 PHENOMENA OF DEVELOPMENT, 5 

 Phenotype, 92, 94, 95, 96, 261 



vs. genotype, 127 



Phototropism of Seedling, 41, 42 

 PHYLLOXERA, degeneration, of male- 

 producing spermatozoa, 166 

 Physiological characters, inheritance 

 of, 69 



division of labor, 31 



processes, 8-10 



states, 50, 312 



tests, 32, 170 



units, 129 

 Pigeons, behavior of, 51, 52 



numerous races, 248, 249 

 PITHECANTHROPUS ERECTUS, skull, 271 

 "Plasomes" of Wiesner, 129 

 Plasticity of behavior, 51, 52 

 "Plastidules" of Elsberg and Haec- 



kel, 129 



Plastosomes, equal division of, 200 

 PLATE, ancestors of German Emper- 

 or, 78 



factors for coat colors of mice, 

 102 



Mendelian inheritance in man, 



II5-H9 



PLATO, on transmigration, 33 

 Polar bodies, n, 156 

 Polarity, 100, 191 



of Styela egg, 141, 143, 146 

 Pollen, 10 



Polydactylism, 69, 115 

 Polyhybrid, 91 

 Population, normally stationary, 291 



of Europe, 292 

 Poultry, selection for egg production, 



255 



PREFORMATION, 57, 175, 268, 305 

 "Preinduction," in Daphnia, 235 

 "Preinheritance," 112, 197 

 Prepotency, 81 

 PRESENCE AND ABSENCE HYPOTHESIS, 



Primitive sex cells, 126, 148 

 Principles of good breeding, viola- 

 tion of, 278 



Propagation of worst, 278 

 PROTENOR, sex differentiation in, 158 

 Protoplasmic and Cellular Organizaa- 



tion, 6 



Psychical Anlagen, 36 

 Psychial development, table of, 56 

 PSYCHOLOGICAL CHARACTERS INHER- 

 ITED, 70 



