United States or Belarus ? Vote for the TOP Country of the Week !


The plants that grew from these two sets of seeds were very different, those from the self-fertilized seeds being smaller and weaker in every way than those from the seeds fertilized with pollen from another plant, or cross-fertilized, as we say, thus proving that it is not best for the plant to be self-fertilized.

At G we see the orchid after the moth's visit the stigma covered with pollen, and the flower thus cross-fertilized.

This solution was made logical and tenable only on the assumption that such evolved conditions, insuring cross-fertilization, were of distinct advantage to the flower in the competitive struggle for existence, and that all cross-fertilized flowers were thus the final result of natural selection.

The plant seldom sets seed in this vicinity, but seems to depend rather upon its tuber-like rootstocks in which the leaves lie curled all through the winter. The hepatica attracts pollen-feeding flies, female hive-bees and the earliest butterflies, and is thus cross-fertilized to some extent; but it is thought also to be able to effect self-fertilization.

Other inventors had worked from the standpoint of the telegraph; and they never did, and never could, get any better results than signs and symbols. But Bell worked from the standpoint of the human voice. He cross-fertilized the two sciences of acoustics and electricity. His study of "Visible Speech" had trained his mind so that he could mentally SEE the shape of a word as he spoke it.

It is probable that an accessory cross-fertilization frequently results from a mass of the pollen falling directly upon the stigma of a neighboring blossom, or even upon its own stigma, but even in the latter case, as has been absolutely demonstrated as a general law by the experiments of Darwin, the pollen from a separate flower is almost invariably prepotent, and leads to the most perfect fruition, and thus to the survival of the fittest the cross-fertilized.