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A 
NATURAL HISTORY 
Of a great Variety of 
Aerial, Terrestrial, and Aquatic 
ANIMAL S, &c. 
CONSIDERED AS 
MICROSCOPIC OBJECTS. 
Of the circulation of the blood, and how to 
examine it by the microfcope. 
HIS noble fluid, the blood, yields us the mofl: 
fublime fpeculations imaginable, by the afliff- 
ance of the microfcope. For by the help of 
it, human blood, and that of land animals, is 
found to confift of round red globules, which - float in a 
tranfparent fluid, each of which is compos’d of flx fmal- 
ler, and more tranfparent ones, and each of thefe (as 
Mr. Leeuwenhoek has {hewn in his 128th epiftle to the 
Royal Society) into fix more minute and without colour. 
He hath alio {hewn us, how eafily fix foft flexible glo- 
B bales. 
