434 AN ACCOUNT OF, &c. 



utterly unable to explain it. I do not, however, 

 suppose, that their different susceptibility of 

 diseases depends, properly, on their difference 

 of colour. On the contrary, I think it proba- 

 ble, that this is only a sign of some difference 

 in them, which, though strongly manifested by 

 its effects in life, is yet too subtle to be disco- 

 vered by an anatomist after death 5 in like 

 manner as a human body, which is incapable of 

 receiving the small-pox, differs in no observable 

 thing from another, which is still liable to be 

 affected with that disease. 



Regarding then as certain, that the negro 

 race are better fitted to resist the attacks of the 

 diseases of hot climates than the white, it is 

 reasonable to infer, that those, who only ap- 

 proach the black race, will be likewise better 

 fitted to do so, than others who are entirely 

 white. This is, in fact, found to be true, with 

 regard to the mixture of the two races ; since 

 mulattoes are much more healthy in hot cli- 

 mates than whites. But amongst men, as well 

 as among other animals, varieties of a greater 

 or less magnitude are constantly occurring. In 

 a civilized country, which has been long peo- 

 pled, those varieties, for the most part, quickly 

 disappear, from the intermarriages of different 

 families. Thus, if a very tall man be produced, 

 he very commonly marries a woman much less 



