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rated by Cantharides , or Fire, it is much tougher and 
thicker, ceteris paribus, and more difficult to raife, 
in black than white People. 3. Negroes are never 
iubjed to be fun-burnt, or have their Skins bliftered 
by any fuch Degree of Heat, as Whites are ; but, if 
we confider, that a black Body retains more Heat 
than a white one, or any other Colour, it will be 
very plain, that their Skins mud be thicker or denfer, 
1. e. more cartilaginous or callous, to award off this 
Violence of the Sun's Beams. 4. Altho’ their Skins, 
in fome particular Subje&s, fhould not be fo very 
thick in Subftance, yet in Winter, when they are 
dry, and not covered with that greafy Sweat which 
tranfudes thro’ them in Summer, their Skins feel 
more coarfe, hard, and rigid ; as they do in ardent 
Fevers, with a dry Skin. 5, Their Exemption from 
fome cutaneous Difeafes, as the Itch, prickly Heat or 
E/fere , which no adult Negroes are troubled with, 
but thofe of line and thin Skins are mod fubjed to, 
fhew the Thicknefs or Calloflty of their Skins, which 
are not eafily affe&ed from flight Caufes. 6 . But 
not only the Thicknefs, but likewife the Opacity of 
their Skins, will appear, from their never looking 
red in Blufhing, or ardent Fevers with internal In- 
flammations, nor in the Meafles, or Small pox; where, 
altho’ the Blood mud be forcibly impelled into the 
fubcutaneous Vcflels, yet it docs not appear thro’ the 
Epidermis. The like may be faid of their Veins; 
which, altho’ large and fhallow, yet do not appear 
blue, till the Skin is cur. 7. In the Jaundice, Ana* 
/area, &c. the Skin of Negroes never fhews the Co- 
lour of the Parts under it ; altho’ viftble enough in 
the Eyes: Of which 1 lately faw a more convincing 
Proof 
