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PART I.

OF

THE PHYSICAL RELATIONS

OF

INSTINCT.

INTRODUCTORY REMARKS.

MAN is especially distinguished from the lower animals by the consciousness of a Supreme Ruler of the world, and by the dominion he is enabled to exercise over the earth and its productions. He is distinguished also by the restless and insatiable desire of knowledge, the capacity to attain it, and the power to perpetuate it from one generation to another.

But, notwithstanding so wide a barrier separates him from the brute, yet the national and intellectual varieties among mankind are so great as, on a superficial view, almost to constitute specific distinctions and to establish as near an affinity, in point of intelligence, between the lowest of these and the most sagacious brute, as between the most enlightened and ignorant of the human family. As one man differs so widely from another, we may also distinguish the wise man from the simple by the consistency of his conduct, and by the use he is accustomed to make of his acquired knowledge.

Now, the departments of human knowledge are va rious like the motives which actuate different persons in the pursuit. Some individuals have a natural in

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