INDEX 



545 



Nicotine, a toxin, 243, 307 



Nucleus, of cell, the bearer of heredity, 3 



Nutriment, as material for growth, 6 ; as 



stimulus, 7 ; and inborn traits, 14-16 ; 



alleged cause of variations, 99 



O 



OBSCURED facts, 33 



Offspring, relation to parent, 5 



Old age, mind in, 421 



Opium, a toxin, 243, 307 ; toleration of, 247 ; 



racial susceptibility to, 306-7 ; evolution 



against, 309 ; compared to malaria, 308 ; 



substituted for alcohol, 460, 462 

 Organisms, unicellular and multicellular, i ; 



primitive, 9 

 Orthodoxy, in religion, mental influence of, 



492 et $eq. 



Orton, Mr J. H., on hermaphroditism, 114 

 Osborn, Prof. H. F., on acquirements, 72 ; 



method of work, 185 ; on plasticity, 408 



PAGANS, ancient, social state and religion, 

 427 ; mental training of, 490, 500 



Palaeontology, 392 



Palm wine, 299 



Pandemics, 272, 275, 452 



Pangenesis, hypothesis of, 5, 66 



Pansy, evolution of, 112 



Parasites, evolution from saprophytes, 87 



Parental affection, 386, 424. 



Parsimony, law of, 60, 100, 166 ; of nature, 

 96, 138, 196, 202, 402; how caused, 118 et 

 seq., \wetseq. 



Parthenogenesis, 2, 142 ; variations occurring 

 in, 147 ; and Mendelian reproduction, 188 ; 

 conditions of occurrence, 204 



Parthenogenetic types, stability of, 201 



Particulate inheritance, 151 



Pasteur, on rabies, 240 ; on anthrax, 240 ; on 

 immunity, 243 



Patency of sexual traits, 159 ; of Mendelian 

 traits, 60 et seq. 



Pearl, Dr, on paramoecium, 93 



Pearson, Prof. Karl, on science, 37 ; on 

 variability, 94, 149 ; on Filial Regression, 

 134 ; on metaphysicians, 335 ; on natural 

 law, 351 ; inheritance of mental and moral 

 traits, 428 



Peas, Mendel's experiments on, 152 ; Men- 

 delian characters of, 153 ; sweet, compound 

 characters of, 161 



Perception, 326 ; limits of, 340 



Pestilence, 276 



Phagocytes, functions of, 231-2, 247 



Phylloxera, 276 



Physics, study of, compared to biology, 30, 

 34, 51, 211, 505 ; as exact science, 35, 48, 

 50, 345 ; as deductive science, 214, 503 



Physiological isolation, 143, 178, 181 



Pictet, experiments on butterflies, 83 



Pigeons, Ewart's experiments on, 81, 85; 

 latent traits in pure breeds, 165 



Pittacus, on drunkenness, 300 



Plague, human, 271, 276; rabbit, 275 



35 



Plants, regeneration in, n; stability when 

 propagated by cuttings, 94; retrogression 

 in, 121 ; reversion in, 156 



Play, function of, 384, 403, 478 



Pleasure in obeying instincts, 479 



Pleasure and pain, evolution of, 371 ; associa- 

 tion with the will, 373 



Pliny, on drunkenness in ancient Rome, 301 



Poisoning, by microbes, 230 ; by alcohol, 

 306, 456 



Polar bodies, 131 



Polish fowls, 146, 189 



Population, pressure of, 269 



Poultry, Mendelian traits of, 155, 156, 157, 

 160, 167, 172 ; blending of Mendelian traits, 

 160 



Predominance of retrogressive variations, 109, 

 in, 197, 220 



Prejudice, denned, 492 



Prejudices, biological, 32, 511 ; religious, 492 



Prepotency, meaning of term, 195 



rimitive organisms, 9 

 I Primrose, evening, 179 



Probity, inheritance of, 429 



Problems of heredity, the greater, 217 ; 

 practical, 446 



Progression, conditions of, in ; of human 

 races, 223 



Progressive traits, 22 



Prohibition in China, 306, 459 ; among Mo- 

 hammedans, 460 ; in United States, 461 



Properties of objects, 339-341 



Protoplasmic movements, 371 



Prototypes of embryo, 27, 119 et seq. 



Public health, statistics of, 136, 264, 281 



Punnett, Mr R. C., on stability of mutations, 

 169-170 



Pure dominants, 153, 157; recessives from, 

 158 



Pure races, Mendelian traits in, 165 



Purim, feast of, 299 



Purity, gametic, 154 



R 



RABBITS, Ewart's experiments on, 82, 85 ; 

 effects of crossing, 162 ; lethal dose of an- 

 thrax, 86 



Rabies, cure of, 239, 245, 246 



Races, human, differentiation of, 181 ; rapid 

 mental change of, 427, 497 



Racial, change, definition, 221 ; inferiority, 



497 



Reality, deductive appeal to, 41 



Reason, defined, 377 ; distinguished from 

 instinct and intelligence, 378 



Reasoning, nature of, 340 



Recapitulation, of parental development, 21 ; 

 of the evolution of the race, 24 et seq., 116 

 et seq., 250, 268, 387 ; occurs only amongst 

 multicellular types, 23 ; inaccuracy of, 25, 

 118 et seq. ; evidence furnished by embryo, 

 28 ; correct method of proving, 54, 505 ; 

 utility of, 57 ; of ancestors, 125 ; Prof. 

 Turner on, 517 et seq. 



Recessives, 153 ; dominants from, 158 



Reduction of chromosomes, 131 



Reflexes, 371 ; imitated by automatic actions, 

 411 ; distinguished from instincts, 374 



Reformation, the Protestant, 427, 497 



