Again, in order that a being possess a capacity for education, it must have the ability to realize within itself what belongs to its species or race.

If an acorn could develop itself so that it could realize, not only its own possibility as an oak, but its entire species, and all the varieties of oaks within itself, and without losing its particular individuality, it would possess the capacity for education. But an acorn, in reality, cannot develop its possibility without the destruction of its own individuality. The acorn vanishes in the oak tree, and the crop of acorns which succeeds is not again the same acorn, except in kind or species. "The species lives, but the individual dies," in the vegetable world.

So it is in the animal world. The brute lives his particular life, unable to develop within himself the form of his entire species, and still less the form of all animal life. And yet the animal possesses self-activity in the powers of locomotion, sense-perception, feeling, emotion, and other elementary shapes. Both animal and plant react against surroundings, and possess more or less power to assimilate what is foreign to them. The plant takes moisture and elementary inorganic substances, and converts them into nutrition wherewith to build its cellular growth. The animal has not only this power of nutrition, which assimilates its surroundings, but also the power of feeling, which is a wonderful faculty. Feeling reproduces within the organism of the animal the external condition; it is an ideal reproduction of the surroundings. The environment of the plant may be seized upon and appropriated in the form of sap, or in the form of carbonic acid, for the nourishment of that plant; but there is no ideal reproduction of the environment in the form of feeling, as in the animal.

In the activity of feeling, the animal transcends his material, corporeal limits—lives beyond his mere body, and participates in the existence of all nature. He reproduces within himself the external. Such being the nature of the activity of feeling, which forms the distinguishing attribute that divides animals from plants, the question meets us at the outset, "Why is not the animal capable of education? Why can he not realize within himself his entire species or race, as man can?"

In order to settle this fundamental question, we must study carefully the scope and limits of this activity, which we have termed "Feeling," and which is known under many names—as, sensation, sensibility, sensitivity, sense-perception, intuition, and others.

Education aims to develop the mind as intellect and will. It must know what it is to develop, and learn to distinguish higher or more complete stages of intellect and will from those which are rudimentary.

Again, the discussion of mind begins properly with the first or most undeveloped manifestation—at the stage where it is common to brutes and human beings. Hence we may begin our study of educational psychology at this point where the distinction between animal and plant appears, and where the question of the capacity for education arises.

When we understand the relation of feeling or sensibility to the higher manifestations of mind, we shall see in what consists a capacity for education, and we shall learn many essentials in regard to the matter and method, the what and the how of education.

A general survey of the world discovers that there is inter-action among its parts. This is the verdict of science, as the systematic form of human experience. In the form of gravitation we understand that each body depends upon every other body, and the annihilation of a particle of matter in a body would cause a change in that body which would affect every other body in the physical universe. Even gravitation, therefore, is a manifestation of the whole universe in each part of it, although it is not a manifestation which exists for that part, because the part does not know it.

There are other forms wherein the whole manifests itself in each part of it—as, for example, in the phenomena of light, heat, and possibly in magnetism and electricity. These forms of manifestation of the external world upon an individual object are destructive to the individuality of the object. If the nature of a thing is stamped upon it from without, it is an element only, and not a self; it is dependent, and belongs to that on which it depends. It does not possess itself, but belongs to that which makes it, and which gives evidence of ownership by continually modifying it.