Sex is not a necessary attribute of all living things.. [it is] a most necessary attribute if progress in evolution of new forms is to occur, as they… - Luther Burbank

When certain hereditary tendencies are almost indelibly ingrained, environment will have a hard battle to effect a change in the child; but that a change can be wrought by the surroundings we all know. The particular subject may at first be stubborn against these influences, but repeated application of the same modifying forces in succeeding generations will at last accomplish the desired object in the child as it does in the plant.

It is increasingly necessary to impress the fact that there are two distinct lines in the improvement of any race: the environment which brings individuals up to their best possibilities; the other, ten thousand times more important and effective, selection of the best individuals through a series of generations.

The mere crossing of species, unaccompanied by selection, wise supervision, intelligent care, and the utmost patience, is not likely to result in marked good, and may result in vast harm. Unorganized effort is often most vicious in its tendencies.