believe, be accounted for by too close interbreeding having been avoided.

Now let us turn to the results arrived at by a third most experienced hybridiser, namely, the Hon. and Rev. W. Herbert. He is as emphatic in his conclusion that some hybrids are perfectly fertile — as fertile as the pure parent-species — as are Kolreuter and Gartner that some degree of sterility between distinct species is a universal law of nature. He experimented on some of the very same species as did Gartner. 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