21 
Hcemafiatks,, 
, Ventricle, at the Inftant when it begins firft 
to contraft, fo as to fuftain the Prefliire of the 
arterial Blood, will be that Surface or Area 
multiplied into the perpendicular Height of 
the Blood in the glafs Tube, viz. x 114- 
Inches, viz. 29<^4 cubic Inches of Blood. 
21. And a cubic Inch of Blood weighing 
267.7 Grains, thefe multiplied into 2964 the 
Number of cubic Inches, and then reduc- 
ed into Pounds gives 113.22 Pounds, which 
is the Sum of the PreiTure of the Blood, which 
this Ventricle fuftains, at the Inftant when it 
is going to exert a contradive Porce, fufficienc 
to propel it with eonfiderable Velocity into 
the Aorta. 
2 2.The Scruple A voirdupoife contains 18.2^ 
Grains, the Ounce 23^8 Grains, the Pound 
7008 Grains. 
23. The Area of the greateft Sedion of 
this Ventricle from Afox to Bafe being 6.83 
fquare Inches; thefe multiplied into 1 14 In- 
ches, the perpendicular Height of the Blood 
in the Tube, give 778.63 cubic Inches of 
Blood, equal to 29.7 Pounds ; the Force of 
the Blood which the mufcular Fibres in that*, 
tranfverfe Sedion of the Ventricle muft refift. 
24. The Velocity with which the Blood is 
C 3 thrown 
