234 



INDEX 



Frogs, determination of sex by en- 

 vironment, 192 



Fungi, symbiotic with Alycc (lichens), 

 95 



GALTON, Sir Francis, on blending 



colours in half-castes, 181 

 on Darwin's theory of pangenesis, 



119 



theory of heredity, 119 

 Gametes, definition of, 5 



Mendel's theory of segregation of, 



169-70 



relation of to Soma, 5 

 Gastrula, definition of (footnote), 35 

 Gauss's law of frequency of error, 99 

 Germ-cells, effect of environment 



npon, 135-6, 152-3, 162-4 

 effect of alcoholism upon, 135 

 variations in, 164-5 

 Germinal localisation, theory of, 8 

 experiments on, by Roux, Morgan, 



Wilson, Zoja, 10 

 Germ-plasm, continuity of, 55 

 O. Hertwig's theory of, 56 

 de Vries' theory of, 58 

 Gibson, Harvey, on gradual adapta- 

 tion in Campanulas, 90 

 Godlewski, experiments with enu- 

 cleated ova, 35 

 on function of cytoplasm in 



heredity, 37 



Grafts, variations in, 67-8 

 Growth, effect of sickness upon, 



152-3 



Gruber, experiments with unicellular 

 animals, 32 



HALF-CASTES, blending of characters 



in, 180-1 



Herbert Spencer's definition of here- 

 dity, 45 

 Hereditary characters, chromatin 



bearer of, 33 

 nucleus bearer of, 34. 

 Hereditary substance, chromatin as, 



18 



conclusions with regard to, 39 

 general discussion of localisation, 



12 



Nageli's theory of, 9, 11, 114 

 Roux-Weismann theory of, 9, 11. 

 Hereditary disease, 13<5-7, 218-9 

 Heredity, Gallon's theory of, 119 

 Herbert Spencer's definition of, 



45 



Herschel's illustration of Gauss's 

 law, 99 



Hertwig (Oscar), theory of germ- 

 plasm, 56 



O. & R., experiments with enu- 

 cleated ova, 31 

 Hicracium, Mendel's experiments 



with, 185 

 Higher animals distinguished from 



lower, 53 

 Hipparion, 115 



His, W., theory of germinal localisa- 

 tion, 8 



Holothurians, adaptation in, 86 

 Honey ants, 151-2 

 Horse, hybrid with zebra, 128 



piebald, 180 



House-fly, capacity for multiplica- 

 tion, 97 



Hybernia leucophoeria, 82 

 Hybridism, effect of, upon Mendelian 



characters, 176-7 

 Hybrids, 74-5, 117-8, 177-9, 181 

 between cattle and bison, 117 

 fertility of, 75 

 among fishes, 117-8 

 Hydatiiia, experimental determina- 

 tion of sex in, 192 

 Hydra, eggs of, infected with Algae, 



137 



regeneration after injury, 68 

 Hypoblast, 69 



IDIOPLASM theory, 9, 11, 114, 122 



and recapitulation, 114, 122 

 Immunity to atoxyl in trypanosomes, 



139, 142 



to disease, 103-8, 215-6, 218-9 

 to disease, power of acquiring, 105 

 to malaria, 103 

 to malaria, Charles Mercier upon, 



157-8 



to measles, 105, 216 

 to scarlet fever, 108, 216 

 to tuberculosis, 106, 215-6 

 Inborn characters, classification of, 



53 



definition of, 46 

 modification of, 50 

 Inborn variations, effect of environ- 

 ment upon, 135-6, 157, 163-5 

 Individual character, sex an, 210 

 Individual characters in chromo- 

 somes, 128, 189 

 definition of, 103 



transition of to racial, 103-8, 213-4 

 transmitted alternatively, 184-9, 



213 

 Individual variations, 102 



eliminated in a short time, 121-3 



