’I 
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of the Colour of Negroes, from an Addition of the 
the Bile, or other atrabilious Humour, as they arc 
pleafed to talk. 
Proposition V. 
The Epidermis, efpecially its external Lamella, is 
divided into two Tarts, by its Tores and Scales , 
two hundred times lefs than the Tarticles of 
Bodies , on which their Colours depend,. 
Sir Ifaac Newton informs us, that the Particles of 
Bodies, on which their Colours depend, are abouc 
600 times lefs than thofe which can be difcerned with 
the naked Eye ; Opt . lib. II. Tart 3 . Prop. 7. But Leeu- 
wenhoeck Ihews, that a Portion of the Epidermis , 
no bigger than what can be difcerned with the naked 
Eye, is divided into 125000 Pores ; which Pores muft 
divide fuch a Portion of the Skin as can be difcerned 
with the naked Eye, into 125,000 Particles; there- 
fore each of thefe Parts of the Skin, between its 
Pores, muft be about two hundred times lefs than thofe 
Particles, on which the Colours of Bodies depend j 
for — V 0 ° 0 0 ° ~ 20 8-j not to mention, that fuch a 
Portion of the Epidermis is further divided into 250 
Scales, which muft increafe the Number of Parts 
into which it is divided. Nor will any one think, 
that the Smallnefs of thefe Parts and Pores exceeds 
Credibility, who confiders, that they convey the mi- 
nuted Particles of our laft Digeftions ; and were they 
even large enough to convey the Particles of many 
Waters, it is very probable, that all our Fluids might 
in time evaporate thro’ them. Nor is it any thing to 
our prefent Purpofe, whether thefe Numbers be ma- 
thematically 
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