Such are, briefly, the more prominent laws of climate, and their influence on men and animals; but as climate itself, in the ordinary meaning of the word, has regard only to degrees of latitude, or to modifications of heat and cold, they are of secondary importance, or, at most, are only a portion of those general laws of adaptation which govern animal existence, and harmonize it with the locality in which it was originally created. Beyond the few exceptions referred to, all organic existence is adapted to its own centre of life, and incapable of living in any other. This is illustrated every day, and familiar to the least observing among us. Cereals and vegetables of every kind demand, if not always a special climate, certainly a special soil. Corn, wheat, etc., require a soil suited to them—there must be a special adaptation of external circumstances, for there is an eternal relation between the organism and the circumstances that surround it. The most ignorant among our agriculturists know from their own experience that certain things can only grow on certain soils, and this fixed and indestructible law, thus manifested in the simpler forms of being, pervades the whole organic world. And, as remarked, it is in exceptional instances, or the instances where climate does not govern, that these adaptations to particular soils are essential. In general, it can not be transplanted or removed from its own centre of existence. The products of the tropics—the sugar cane, coffee, indigo, cotton, etc., the numerous fruits, etc., can not be changed, or, at all events, can not be grown successfully outside of their original centre of creation. As we ascend in the scale, the laws of adaptation, are, of course, multiplied, or become more elaborate, and in the case of human beings, they are widely diversified with numerous secondary relations; but the great universal and all-dominating law that unites men to their centres of existence, is as indestructible and everlasting as it is in the simplest form of vegetable existence. God has created both them and the external circumstances, has given them a specific structure and corresponding faculties, and He has made the earth, the soils, the form of its products, its climate, etc., in perfect accord with the former, and as time and chance, or human forces, can never change or modify the works of the Almighty, this law of adaptation is everlasting.