i i 6 Of viewing the Bloody &c. 
latile Oleofum taken with the Food, and fo 
carried into the Ladteals and Blood-VefTels, 
may retain its Power of preventing fuch Co¬ 
agulations as would otherwife happen. 
The Urine, Saliva, Semen, Sweat, Faces 
Alvi, and all other Animal Juices, are like- 
wife Objects for the Microfcope, to be exa¬ 
mined either alone, or mixed with the 
aforefaid Liquors : whence much ufeful 
Knowledge may be acquired. 
As to Colour in the Blood, a Blacknefs 
arifes in it from a Deficiency of Serum, as 
Palenefs does from too great an Abundance 
of it : for it will be always found, that when 
Globules cohere together in too great Num¬ 
bers they give a black Appearance. When 
this therefore is the Cafe, Means of diluting 
fhould be found out and made ufe of; fmce 
it is abfolutely requifite to Health, that the 
Globules of the Blood fhould float in a due 
Quantity of Serum, and be thereby circulated 
freely through the minuted: Veifels ; a con¬ 
trary State to which has proved the Death of 
thoufands. — Mr. Leeuwenhoek tells us, 
that whenever he found his Blood too deep 
coloured, his Way was to drink four Difhes 
of Coffee in a Morning, in the room of his 
ufual two ; and fix Difhes of Tea in the Af¬ 
ternoon, inflead of three. He drank it as hot 
as poflible, and went on in this Manner till 
he perceived his Blood grow paler, and con- 
fequently its Globules farther feparated. 
io CHAP, 
