Natural selection, its general principles, i. 2-14.
Nature, sense in which the term is employed, i. 6.
Naudin, supposed rules of transmission in crossing plants, ii. [68];
on the nature of hybrids, ii. [48]-[49];
essences of the species in hybrids, ii. [386], [401];
reversion of hybrids, ii. [36], [49]-[50];
reversion in flowers by stripes and blotches, ii. [37];
hybrids of Linaria vulgaris and purpurea, ii. [94];
pelorism in Linaria, ii. [58], [346];
crossing of peloric Linaria with the normal form, ii. [70];