408 



SUBJECT INDEX. 



Hare, effect of cold on, 244; vari- 

 tion in, 329 



Heredity, decided at time of 

 fertilisation, 116, 119; Law of 

 Ancestral, 122; solution of 

 problem of, 125; a phase of 

 homotyposis, 137; intensity of, 

 in relation to variability, 211 



Heritage, alternative, 156 



Heritages, unequal from parents, 

 150; absolute amounts of, in 

 offspring, 153 



Herring, local races of, 322 



Homoeosis, in Saw-fly, Humble 

 bee, Crustacea, 54 



Homologous organs, correlation 

 of, 72 



Homotypes, 136 



Homotyposis, 136; relation of, 

 to variability, 211 



Horses, trotting, prepotency in, 

 149 



Humidity, effect of, on plant 

 growth, 262; producing local 

 races, 327 



Hybridisation, Mendel's Law of, 

 155; proof of, 156; scope of, 

 159, 160 



Hybrids, 154; among Echino- 

 derms, 110; variation of struc- 

 ture of, with season, 111; 

 reversion of, 143; dominant 

 and recessive characters of, 

 156; resolved into pure pa- 

 rental forms, 157; useless for 

 breeding, 161 ; give rise to new 

 characters, 161 ; relation of, to 

 parent forms, 161; occurrence 

 of, in nature, 162, 165; arti- 

 ficial, 165; fertility of, 165; 

 bigeneric, 166; binordinal, 166; 

 among Lepidoptera, 167; 

 among Echinoids, 168; with 

 zebras, 168; effect of condi- 

 tion of sex-cells on characters 

 of, 169 



Id, defined, 103 



Identical human twins, 115; 

 measurements upon, 117 



Impregnation, effect of temper- 

 ature at time of, 191 ; effect of 

 salinity, 192 



Indefinite variations, 371 



Index of variability, 20 



India, Lepidoptera of, 316 



Indices of variability, relations 

 between, 28 



Infants, variability of, 205; 

 curves of growth of, 208 



Infection of Germ, 175 



Infusoria, adaptation of, to high 

 temperature, 379 



Inheritance, direct and collateral, 

 determination of, 125; blended 

 and alternative, 132; in man, 

 347; of Acquired Characters, 

 352; of acquired epilepsy, 364; 

 of adaptation, in mould, 377 



Injuries, non-inheritance of, 362; 

 to nervous system of guinea- 

 pigs, 363 



Internal secretions, and action 

 of environment, 358 



Iron salts, effect of, on plant 

 growth, 286 



Isolation, index of, 42 



Isolation, physiological, in ani- 

 mals and in plants, 67; origin 

 of, 68 



Japanese waltzing mice, 142 

 Japanned peacocks, 172 

 Jews, prepotency of, 148 



Larvae, of Lepidoptera, effect of 



food on, 291 



Larvae of sea-urchin, method of 

 obtaining, 105; influence of 

 sex-cells on size of, 107; in- 

 fluence of season on size of, 

 109; reaction of, to environ- 

 ment, 190; metabolism of, 297 

 Latency of characters, 156, 159 

 Latitude, effect of, on plants, 311 

 Law, of Ancestral Heredity, 122; 

 of Frequency of Error, 10; of 

 Hybridisation, Mendel's, 155; 

 of Reversion, 133 



