The difference in their results may, I think, be in part accounted for by Herbert's great horticultural skill, and by his having hot-houses at his command.

Of his many important statements I will here give only a single one as an example, namely, that "every ovule in a pod of Crinum capense fertilised by C.

revolutum produced a plant, which I never saw to occur in a case of its natural fecundation.

" So that here we have perfect, or even more than commonly perfect fertility, in a first cross between two distinct species.

This case of the Crinum leads me to refer to a singular fact, namely, that individual plants of certain species of Lobelia, Verbascum and Passiflora, can easily be fertilised by the pollen from a distinct species, but not by pollen from the same plant, though this pollen can be proved to be perfectly sound by fertilising other plants or species.