Fixation of varieties, [153]

Fluctuations, [138]

Fowls, coloured from whites, [49], [73]

Galton, [13], [179]

Gametes, nature of, [6]

Gregory, R. P., [55], [93]

Hæmophilia, [176]

Hardy, G. H., [147]

Heterozygote, definition of, [28]

Heterozygote, of intermediate form, [68]