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U 



M 



A 



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275 



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g lor many generations 



and become more and more debafed ; but if negroes, and other 

 fwarthy tribes, be tranfplanted into temperate, or nearly cold cli- 

 mates, they do not immediately change, nor do they ealily be- 

 come fairer, but preferve|]their original complexion for a longer fpace 

 of time. When they only intermarry in their own race, the change, 

 if any, is imperceptible in their offspring for 

 I will here only hint, at the probable caufes of this pha^nomenon ; 

 the tranfition, from being brown in complexion to fair, is, it feems, 

 more difficult, than that from fair to brown ; the Epidermis ad- 



\ 



mits the beams of the fun and the aftion of the air, in colouring 

 the reticulum mucofum brown ; but when once it is coloured, no- 

 thing is fufficiently powerful to extrad; the brown colour ; and this 

 feems to be founded in daily experience 3 a man being perhaps only 

 one day expofed to a powerful fun, fl:iall become ftrongly tinted 



CAUSES 

 OF VARI- 

 ETIES. 



with 



brown; when,, to remove this hue, perhaps fix or eight 



months of clofe confinement, are not fuffici-ent. It feems there- 



em b 



f-TT 



fore more and more probable, that the firll ilamen of an 

 partakes, much of the colour, lize, form and habit of the parents ; 



and that two different tribes, having gradually undergone a dif- 

 ferent round of climates, food, and cufloms ; and coming after- 



H 



wards at different periods of time, and by different ways, into the 

 fame climate, but preferving a different mode of living, and being 

 partly fupported by different food, may neverthelefs prefervc an 



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evident 



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