[ M3 ] - 
Bodyi from whence proceed their lingering acute, 
and obftinately chronical, Maladies, more frequent 
in hot Countries than the former, efpecially among 
the Whites. Negroes, notwithftanding their 
hardier Ufage, are more apt to have their Pcr- 
fpiration obftruded in cold Weather, and contrad 
Fevers from thence 5 whereas, in hot Weather, 
their thicker Hides ferve as a Coat, to keep off 
the Power of the Sun, and preferve the Body againft 
the Moifture of the Air, fo remarkably great, and 
very pernicious, in all hot Countries, efpecially at 
certain Seafons, which are always fickly.— • Hence, 
white People fhould be. bell cloathed in hot Wea- 
ther, and Blacks in cold j a Thing much negleded 
in Virginia , tho’ the Caufe of one half of the un- 
timely Deaths of both Sorts of People in it. 
Coroll. VI. The perfpirable Matter of black or tawny 
People is more fubtil and volatile in its Nature ; 
and more acrid, penetrating, and offenfive, in its 
Effeds ; and more of the Nature, and more apt to 
degenerate to a contagious Miafrna , than the milder 
Effluvia ofWhites. — The Contagion of peftilential 
Fevers proceeds from a Subtilization and Volatili- 
zation of the perfpirable Humours, by the Effeds of 
a preceding Fever, as often, if not more often, than 
from any external Putrefadion, or mineral Exhala- 
tion.— Hence this Acrimony of the perfpirable Hu- 
moursof black and tawny People makes them fubjed 
to malignant and peftilential Fevers, from the fame 
Caufes which breed only putrid benign Fevers 
among Whites ; and in them thefe Fevers are more 
apt to turn contagious, as they thcmfelves are to 
be infeded with fuch Contagion. — - From hence 
feem to have proceeded the ftrft Seeds of the 
T Meafles 
