Every child should have mud pies, grasshoppers, water-bugs, tadpoles, frogs, mud-turtles, elderberries, wild strawberries, acorns, chestnuts, trees to climb, brooks to wade in, water-lilies, woodchucks, bats, bees, butterflies, various animals to pet, hay-fields, pine-cones, rocks to roll, sand, snakes, huckleberries and hornets and any child who has been deprived of these has been deprived of the best part of his education.
By being well acquainted with all these they come into most intimate harmony with nature, whose lessons are, of course, natural and wholesome.

The richest soil that was ever prepared would not grow a single blade of grass or the tiniest Weed if that soil were absolutely dry. ...There must be water in the soil to dissolve out and transfer its elements in order that the rootlets of the plant shall be able to make the slightest use of these elements. ...But ...a plant may grow and thrive for a time quite without the presence of soil if its roots are placed in water. ... some of the richest soils in the world are those that are absolutely barren and fully merit the designation of desert lands because water is lacking

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To the gardener who goes about his task with the right spirit must every plant appear as the most wonderful of laboratories in which miracles of transformation, outmatching the utmost feats of the most skillful conjurer, are being performed every hour.

Look at the material on which to draw. Here is the North, powerful, virile, aggressive, blended with the luxurious, ease-loving, more impetuous South. Again you have the merging of a cold phlegmatic temperament with one mercurial and volatile. Still again the union of great native mental strength, developed or undeveloped, with bodily vigor, but with inferior mind. See, too, what a vast number of environmental influences have been at work in social relations, in climate, in physical surroundings. Along with this we must observe the merging of the vicious with the good, the good with the good, the vicious with the vicious.

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During the course of many years of investigation into the plant life of the world, creating new forms, modifying old ones, adapting others to new conditions, and blending still others, I have constantly been impressed with the similarity between the organization and development of plant and human life.

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The plant, unlike the animal, has provided a special mechanism—a unique laboratory—through which it is able to manufacture from the crude salts in watery solution, with the aid of another element taken from the air, a new compound which will serve the protoplasmic cell with food.
That is to say, the plant organism as a whole comprises a laboratory for compounding the crude elements, which by themselves cannot be used as nourishment, into a substance that can be used as nourishment. ...The plant is the only place in the world where foodstuffs are manufactured, and that no animal of any kind could live without nourishment that was originally manufactured by some plant, the vital importance of the matter will be manifest.

In manufacturing food for its own cells, the plant is producing a supply of food that will be available for the sustenance of animal cells also. Thus the entire animal World may be said to be a vast parasitic colony as absolutely dependent upon the vegetable colony for its essential food supplies as any other parasite is dependent upon its host.

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.

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Power to vary in plants or animals is itself a feature as readily transmissible as is stability of character. The quality of varying to meet varying environments is therefore one of the hereditary traits which the plant breeder must consider, and which may itself be extended or overcome by the processes of crossing and selection.

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.