( 'Oil ) 
Upon making due allowance for the diflerence be- 
tween the Specifick Gravities of the three firft Portions 
of Liquor and that of Seruw^ as likewife for what 
was loft in the two feveral parts of the Operation, 
which we may reafonably conclude to have been of a 
Specifick Gravity nearly the fame with that of the Li- 
quor drawn off, it will be found, that the quantity 
of Serum contain’d in this Mafs of Blood was about ^ 
of the whole VVcighc, and confequently that the quan- 
tity of Craffmentum was .7 of the fame Weight. 
If we calculate therefore upon this Suppofition, that 
the weight of the Globular part of the Blood is ~ of 
the whole, we fhall find the Specifick Gravity of a- 
Blood Globule to be to that of Water as 1177 to rooo. 
If we follow the proportion of ,7, which refults from 
Mr. Bo)le*s Experiments, the Specifick Gravity of a. 
Blood Globule will be 1241. 
But this computation is in all appearance a great’ 
deal too large ; for we cannot be affur’d, that our 
whole quantity of aqueous Liquor was rais’d from the 
Serum of the Blood. On the contrary it is more than 
probable, that a confiderable part of it was afforded 
by the Blood Globules themfelves, efpecially in the' 
latter part of the Operation, when their texture muft of 
neceffity have been broken and diffolv’d by the ftrong' 
Fire that was made ufe of. To prove this, we need 
only confider the condition of the dtyd^Craffamentum, 
after the Fhlegm is drawn off, chat being now a hard 
and brittle Subftance : whereas the Globules in their 
natural State are fofe and yielding. For which reafbns'- 
ic may perhaps be more facisfadory , if we at- 
tempt to find the quantity of the Globular part of the 
Blood after another manner. 
k appears therefore from Mr Boyle's Obfervations,' 
that the quantity of Serum, w’hich may be pour’d off 
^ R from V 
