Most generally the access of the pollen is not trusted to any accidental modes of conveyance, however numerous, elaborate, and, if we may so express it, ingenious, such modes may be; but the Stamens are for greater security lodged in the same flower, under the protection of the same silken veils, or more substantial guards, which shelter their appropriate pistils. This is the case with the majority of our herbs and shrubs, and even with the trees of hot countries, whose leaves being always present might impede the passage of the pollen. On the contrary, the trees of cold climates have generally separated flowers, blossoming before the leaves come forth, and in a windy season of the year; while those which blossom later, as the Oak, are either peculiarly frequented by insects, or, like the numerous kinds of Fir, have leaves so little in the way, and pollen so excessively abundant, that impregnation can scarcely fail.
The pollen and the stigma are always in perfection at the same time, the latter commonly withering and falling off a little after the anthers, though the style may remain to become an useful appendage to the fruit.
