4
Analysis of types, 156
Ancestral Heredity, Law of, 13
Andalusian fowls, 70
Axil colour in sweet peas, 93

Bateson, W., 14, 29, 55, 116, 132, 141
Biffen, R. H., 157
Blue Andalusian fowls, 71
Brachydactyly, 171
Bryony, 120
Bush sweet peas, 63

Castle, 132
Cattle, horns in, 86, 166
Colour, nature of, in flowers, 48
Colour-blindness, 117
Combs of fowls, 33, 43
Correns, C., 29, 120
Coupling of characters in gametes, 93
Cuenot, 50, 119
"Cupid" sweet peas, 62
Currant moth, 99

Darwin, C., 10, 65, 147, 163
De Vries, H., 15, 29, 141
Discontinuity in variation, 14
Dominant characters, 18
Doncaster, L., 99
Drinkwater, H., 172
Dutch rabbits, 60

Eggs, 2
Environment, influence of, 137
_Euralia_, 144
Evolution, 10, 85, 139
Eye, in primulas, 55
Eye-colour, in man, 176

Factor, definition of, 31
Factors, interaction of, 42
Fertilisation, 3
Fertilisation, self- and cross-, 163
Fixation of varieties, 153
Fluctuations, 138
Fowls, coloured from whites, 49, 73

Galton, 13, 179
Gametes, nature of, 6
Gregory, R. P., 55, 93

Haemophilia, 176
Hardy, G. H., 147
Heterozygote, definition of, 28
Heterozygote, of intermediate form, 68
_Hieracium_, 27, 132
Himalayan rabbits, 60
Homostyle primulas, 56
Homozygote, definition of, 28
Hooded sweet peas, 89
Horses, bay and chestnut in, 167
Hurst, C. C., 62, 176, 180

Immunity in wheat, 158
Individuality, 135
Inhibition, factors for, 74, 108
Intermediates, 125
{192}

Johannsen, W., 160

Lop-eared rabbits, 132

Mendel, 8, 17, 26, 132
Mental characters, 180
Mice, inheritance of coat colour in, 50
Mimicry, 143
_Mirabilis_, 151
Morgan, T. H., 116
Mulattos, 129
Mutation, 83, 138

Naegeli, C., 26
Natural selection, 11, 140, 142, 149
Nettleship, E., 175
Night-blindness, 175

_Pararge egeria_, 132
Parkinson, J., 122
Pea comb, 33
Peas, coloured flowers in, 24
Peas, tall and dwarf, 18
Pigeons, 86
Pin-eye in primulas, 55
_Pisum_, 17
Primulas, 31, 55, 68, 93
Pollen, 3
Pollen of sweet peas, 92
Pomace fly, 115
Population, inheritance of characters in a, 147
Presence and Absence theory, 35
Pure lines, 162
Purity of gametes, 24
Purity of type, 155

Rabbits, 53, 60
Ratios, Mendelian--
3 : 1, 20
9 : 3 : 3 : 1, 25, 34
9 : 3 : 4, 51
9 : 7, 49
Ray, John,