The office of the brain we are here considering is to receive, retain, and collate impressions, and, in retaining them, to hold their original force as far as possible, so that the ultimate act, coming from a previous impression, may have the force of the original impulse. The human creature does not originate nervous energy; but he does secrete it, so to speak, from the impact of natural forces. He has a storage battery of power we call the will. By this high faculty we see a well-developed human being working steadily for a desired object, without any present stimulus directed to that end, even in opposition to prevent stimulus tending to oppose that end. This width of perception, length of retention, storage of force, and power of steady, self-determined action distinguish the advanced human brain.
Early forms of life had no brains to speak of. They received impressions and transmitted them in expressions without check or discrimination. With the development of more complex organisms and their more complex activities came the accompanying complexity of brain, which could co-ordinate those activities to the best advantage.

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