236 



INDEX 



Morgan, T. H., embryos from unfer- 

 tilised ova, 30, 38 



experiments on germinal localisa- 

 tion, 10 

 Mules, attempted explanation of 



sterility in, 117 

 Multicellular organisms, definition 



of, 2 

 differentiation of cells in, 4, G, 45, 



68, 69 



fertilisation in, 3, 27 

 life-cycle of, 4, 29 

 Mutants interbreed freely, 75 

 Mutating a character selected by 



man, 100 

 Mutation hypothesis, De Vries', G2-7G 



De Vries' statement of, 72-3 

 Mutations, 63-101 

 absence of in wild plants, 65 

 in Aurclia (jelly-fish) not per- 

 petuated, 65 



difficulty in distinguishing, 63 

 Dixey, F. A., upon, 93 

 in domesticated plants, 64 

 not groundwork of evolution, 100 

 incompatible with adaptation, 77, 



91 



in (Enothera, 64, 71 

 in (Enothera, G. A. Boulanger on, 71 

 perpetuation of, 189 

 Poulton's metaphor upon, 92 

 Thiselton-Dyer on, 72 

 transmitted on Mendelian lines, 



187-9 



Myrmecocystus (honey ant), 151-2 

 Myxine ylutinosa, alternation of sex 

 in, 191 



NAGELJ'S experiments with Alpine 



plants, 136 



idioplasm theory, 9, 11, 114, 122 

 idioplasm theory and recapitula- 

 tion, 114, 122 



Natural selection, misrepresented, 

 155-9 



Nerve-cells do not multiply, 161 



Nepenthe licalcarata, adaptation in to 

 a lemur, 87 



Nucleus bearer of hereditary charac- 

 ters, 34 



function of in heredity, 30-4, 38- 

 40 



Nussbaum's experiments upon 

 Hydatina, 192 



(Enothera, Boulanger's experiments 



upon, 64 

 mutations in, 64, 71 



Ovum, 23 



segmentation of without fertilisa- 

 tion, 30 

 maturation of, 26 



PANGENESIS, Charles] Darwin's 

 theory of. 7, 58 



Galton on theory of, 119 

 Paramccium, conjugation in, 29 

 Parasitic adaptation, 93 



Crustacea, 66 

 Parasites, degeneration in, 153-4 



Mollusc, upon star-fish, 94 

 Parthenogenesis, 28 



in Aphis, 28 



in bees, 28 



polar bodies in, 28 

 Pasthenogenetic forms, variations 



in, 61 



Particulate inheritance, 180 

 Peas, inheritance of starch grains in, 

 182-3 



Mendel's experiments with, 166-9 

 Peckham, G. W. and E. G., on 

 instincts in fossorial wasps, 148 

 Piebald horse, 180 



Pigeons, results of crossing domesti- 

 cated, 113 



Pitcher-plants, adaptations in, 87 

 Placenta, evolution of, 112 

 Plants, adaptations in, 87 



regeneration of tissue in, 68-9 

 Play in mammals, 49 

 Polar bodies, 27 



in parthogenesis, 28 

 Polydactylism, 131 

 Polymorphism in ants, 150-2 

 Polyzoa, Harmer on variations in, GO 

 Poulton on continuity between 

 species, 73 



metaphor upon mutations, 92 

 Precis, seasonal changes in, 84 

 Prehistoric man, physical characters- 



of, 120 

 Prepotent characters, 179-80 



races, 180 

 Progressive variations, 109 



at all stages of development, 112 

 Pronuba, adaptation to Yucca, 88 

 Protective coloration, 83 

 Protoplasm, 1 



Front's and Bacot's experiments with 

 Lepidoptera, 186-7 



QUETELET on Gauss's law, 99 



RABBITS, effect of inoculation with 

 trypanosomes, 140 



