19 
Hcemajlatks. 
that inftant, the Blood flowing in from the 
Auricle has opened the mitral Valves inward, 
while at the (ame time the contrading Arte- 
ries repell the Blood forcibly againfl; the (cmi- 
lunar Valves,* but at the Inftanc that the 
Ventricle contrads, the mitral Valves are 
clofed, being expelled by the Blood outwards, 
while at the fame time the fcmilunar are by 
the fame Adion opened outwards, to m.ake 
way for the comprefled Blood to rufli into the 
Aorta. 
\ 6 . So that this Piece of Wax thus form- 
ed, may reafonably be taken to be nearly com- 
menfurate to the Qiiantity of Blood received 
into this Ventricle at each Diajiole, and is 
thence propelled into the Aorta at the fub- 
fcquent Syjloles. 
17. Having therefore filled a narrow mouth- 
ed Veffel brim-full of Water, I immerfed the 
Wax in it, then taking it out of the Water, 
I filled the VeflTel brim-full again, from ano- 
ther Veflel whofe Capacity was divided* into 
cubic Inches, which gave the Bulk of the 
Wax, and confequently the Capacity of the 
left Ventricle, equal to ten cubic Inches* 
18. I got the Quantity of the Surface of 
the Sides of this Ventricle by laying Pieces 
C t of 
