absorption of Mirabilis vulgaris by M. longiflora, ii. [88];
crosses of species of Verbascum, ii. [93], [107];
on the hollyhock, ii. [107];
crossing varieties of tobacco, ii. [108];
benefits of crossing plants, ii. [130], [131], [175]-[176];
self-impotence in Verbascum, ii. [136], [141];
effects of conditions of growth upon fertility in Mirabilis, ii. [164];
great development of tubers in hybrid plants, ii. [172];
inheritance of plasticity, ii. [241];
variability of hybrids of Mirabilis, ii. [265];