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sudden changes of climate are hazardous; but nor more hazardous than equally great and sudden changes in our habits of living. This argument, there-fore, proves only that such alterations ought always to be made with due precaution. And if this prudential conduct be observed the human constitution has been found capable of enduring the influence of every climate. It becomes, in time, assimilated to its situation. And in southern regions especially, the bilious habit, and the dark complexion, which, in many instances, were originally the effects of disease, become, at length, necessary to the most comfortable and healthful state of the body -- In America we are liable to disease by removing in-cautiously from a northern to a southern State and even from one part to another of the same State : but shall be conclude thence that we are not of one species from New-Hampshire to Georgia? Shall we conclude that the top of every hill, and the bank of every river are inhabited by different species, be-cause the latter are less healthy then the former? The constitution often becomes so attempted even to an unhealthy region, that it feels augmented symptoms of disorder on returning to the most sal-brious air and water : but does this provide the na- 

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ture designed that such men should never remove, when it might be in their power, to a situation in which they could drink clear water, or breathe a pure atmosphere? 
HIs lordhship's second argument is certainly an extra-ordinary example of philosophic reasoning. -- "Men, says he, must have been originally of different stocks, adapted to their respective climates, because an European degenerates both in vigor and colour on being removed to South America, to Africa, or to the East-Indies."-Would not true philosophy have drawn from this fact a contrary conclusion? Certainly, if an European had not changed his colour, with various other properties of his constitution, as he does, that is, if he had not degenerated to a nearer resemblance to the natives of Africa, Amer-ica, or the Indies, it would have been a much stronger evidence of the original difference of the respective races.
The degeneracy of the human constitution often produced by change of climate, he confirms by the ex-ample of a Portuguese colony on the coast of Congo, who, in a course of time, have degenerated so much, that they scarce retain the appearance of men."-A fact more to the purpose of the preceeding essay
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