Hcemafiatks. 39 
bcr of Pulfes in one Minute, hence fifty two 
Pounds, a Quantity equal to the Dog*s Weight, 
will pafs thro' the Heart in 11.9 Minutes. 
8. If according to Dr. Keilh Efiimate the 
left Ventricle of a Man's Heart throw out 
in each Syflole an Ounce or cubic Inch 
df Blood, and the Area of the Orifice of 
the Aatta be ===0.41875 then dividing the 
former by this, the Qiiotient 5.96 is the Length 
of the Cylinder of Blood, which is formed 
in pafllrtg thro* the Aorta in each SjfioJe of 
the Ventricle ; and in the feventy five Pul- 
fes of a Minute a Cylinder of 297 Inches 
Lengdi will pafs this at the Rate of 1493 
Feet in an Hour. But the Sjflole of the Heart 
being performed in one third of this Time, 
the Veloeity of the Blood in that inftant will 
be thrice as much, v-iz. at the rate of 4479 
Feet in an Hour, or 74;^ Feet in a Minute. 
And if the Vehtriele throws out 1.172 
cubic Inch hiaPulfe, then in the feventy five 
Pulfes of a MihUte Tie Qiiantity of Blood 
will be equal to 4.37 Pounds, and in ^ 6 .^ 
Minutes a Quantity equal to a middle-fized 
Man, *viz, a hundred and fixty Pounds will 
pafs thro* the Heart. 
