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

The most interesting thing in the world, from the standpoint of animal economy—which of course includes human economy—is the wonderful laboratory or factory of the plant...

A knowledge of Mendelism is recognized by me as only the ABC to the broader knowledge of heredity necessary for success in animal and plant improvement, and all variations and all mutations of every nature are responses to environment which, by repetition and combination, are slowly but surely fixed in heredity and at last made tangible, most often through the crossing of varieties, species, or genera, either by nature or that part of nature called man.

In child rearing environment is equally essential with heredity.