( 1007 ,) 
Exp, XI. July 14. 1 71 9. I procur’d a quantity 
of Blood taken from the temporal Artery, from which 
I drew off the Serum the next Day, 'and weighing it 
in the fame manner found it’s Specifick Gravity to be 
I0i8, 8. 
Thefe Experiments agree fo nearly together, that 
the little difference between them may very well be 
attributed to that which is between the Serum of dif- 
ferent Perfons; or to the variations occafion’d by heat 
and cold in the feveral Seafons of the Year, in which 
they were made. So that from them we may fafely 
determine the Specifick Gravity of Serum of Human 
Blood at a Medium to be 1019, or in a round num^' 
ber lojo. From which the greatefi: Variation in any 
of thefe Experiments is little more than one in 10005 
whereas the difference between Mr. Boyle's Experiments 
and mine amounts to 160 in 1000. 
Exp, XI k ^pril 6. 1717. In order to find the 
Specifick Gravity of Human Blood, which, by reafon 
of it s tenacity, and fudden alterations upon {landing, 
cannot be determin’d by the Hydroftatical Balance ; I 
took a narrow* neck’d Vial , and fill’d it to a Mark,, 
with Blood pour’d immediately out of the Porringer, 
as foon as the Perfon was blooded. This 1 weigh’d, 
as I had done the Serum before, and found it’s Speci- 
fick Gravity to be 105'r. 
Exp. XIII. Aug, 5th. 1717. Having fill’d the fame 
Vial with the Blood of another Perfon, running im- 
mediately out of the Vein through a Funnel, it’s Spe- 
cifick Gravity was determin’d at 1053. 
Suffering this to (land till it was cold, I found the 
Blood was funk a fmall matter below the Mark in the 
neck of the Vial. This being fill’d up with the Wa- 
ter, w’hich in fb fmall a quantity could make ao fenfi- 
ble. 
