Some Account of the Blood . 1 6$ 
flood, I fhall borrow two Draughts frorii 
Mr. Leeuwenhoek. 
Fig. I. Plate X. Thews one fiich large 
Globule, wherein five of the fmaller Sort 
that compofe it appear in Contact, the fixth 
lying behind. 
Fig. II. fhew-s how, by their mutual At¬ 
traction to, or PrefTure again if each other, 
they readily unite to form a perfect round 
Body. 
It is alfo eafy to conceive, that thefe fix 
Globul es, and even the more minute ones 
hill whereof they are compounded, may 
occafionally be feparated, in order to pafs 
through fuch extremely minute VefTeis as 
without Separation they cannot poffibly en¬ 
ter ; and may re-unite when they meet 
again in VefTeis where they have more Room. 
And we are very certain, that fometimes 
they cohere in greater Numbers, and form 
larger MafTes, than are confident with a free 
and healthy Circulation. 
Mr. Leeuwenhoek and Dr. Jurin, af¬ 
ter the muff accurate Admeasurement, by 
the Way defcribed page 46, agreed, that the 
Diameter of a common red Globule of hu¬ 
man Blood is equal to the *■ one thoufand 
nine hundred and fortieth Part of the Length 
of an Inch. MerLeeuwenhoek before 
j 3 O. >0 
* Vid* Philofoph, TranfaQ, Numb, 10 6. 
this 
i 
