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The hypothesis that the reason for this selective retention on the part of individuals is a special quality, deep-seated in the flowers themselves, seems more probable. We have probably here to do with the presence, just as in human beings, of a maximum degree of sexual attraction between individuals, one of which possesses just as much femaleness as the other possesses maleness, and this is merely another mode of stating my sexual law. The probability of this interpretation is increased by the fact that in the short-styled, long-anthered, more male flowers, the pollen grains are larger and the papillæ on the stigmas are smaller than the corresponding parts of the long-styled, short-anthered, more female flowers. Here we have certainly to do with different degrees of maleness and femaleness. These circumstances supply a strong corroboration of my law of sexual affinity, that in the vegetable kingdom as well as in the animal kingdom (I shall return later to this point) fertilisation has the best results when it occurs between parents with maximum sexual affinity.ssss1