To this argument, we shall add one that is incontrovertible, which is, that when the _black_ inhabitants of _Africa_ are transplanted to _colder_, or the _white_ inhabitants of _Europe_ to _hotter_ climates, their children, _born there_, are of a _different colour from themselves_; that is, lighter in the first, and darker in the second instance. As a proof of the first, we shall give the words of the Abbé Raynal[086], in his admired publication. "The children," says he, "which they, (the _Africans_) procreate in _America_, are not so black as their parents were. After each generation the difference becomes more palpable. It is possible, that after a numerous succession of generations, the men come from _Africa_ would not be distinguished from those of the country, into which they may have been transplanted." This circumstance we have had the pleasure of hearing confirmed by a variety of persons, who have been witnesses of the fact; but particularly by many intelligent[087] Africans, who have been parents themselves in _America_, and who have declared that the difference is so palpable in the _northern provinces_, that not only they themselves have constantly observed it, but that they have heard it observed by others. Neither is this variation in the children from the colour of their parents improbable. _The children of the blackest Africans are born white_[088]. In this state they continue for about a month, when they change to a pale yellow. In process of time they become brown. Their skin still continues to increase in darkness with their age, till it becomes of a dirty, sallow black, and at length, after a certain period of years, glossy and shining. Now, if climate has any influence on the _mucous substance_ of the body, this variation in the children from the colour of their parents is an event, which must be reasonably expected: for being born white, and not having equally powerful causes to act upon them in colder, as their parents had in the hotter climates which they left, it must necessarily follow, that the same affect cannot possibly be produced. Hence also, if the hypothesis be admitted, may be deduced the reason, why even those children, who have been brought from their country at an early age into colder regions, have been observed[089] to be of a lighter colour than those who have remained at home till they arrived at a state of manhood. For having undergone some of the changes which we mentioned to have attended their countrymen from infancy to a certain age, and having been taken away before the rest could be completed, these farther changes, which would have taken place had they remained at home, seem either to have been checked in their progress, or weakened in their degree, by a colder climate.