8 Hcemajlatks. 
Veins, which, with what was drawn out at 
the Artery, makes up twenty Quarts, equal to 
IIJ4 cubick Inches, or forty four Pounds; 
which at a low Eftimation, may be reckoned 
the Quantity of current Blood in a Horfe; 
there is doubtlefs confiderably more, but it is 
not eafy to determine how much. 
14. As this Experiment fliews how much 
the Force of the Blood in the Arteries is 
abated by different Degrees of Evacuation; 
fo it may be of ufe to direft what Quantity 
to let out at a Time in bleeding: For what- 
ever the real Quantity of the circulating 
Blood be, it is certain that the Eftimate of 
what can be with fafety let out at once, muft 
be taken from the Proportion which that 
bears to-the whole Qiiantiry of Blood, which 
will flow out of the Vein or Artery of the 
Animal till it dies. 
ly. We fee alfo from this Experiment, the 
Reafonablenefs of the Pradice of bleeding at 
feveral diftant Times, where it is requifitc 
to take away a great Quantity of Blood, and 
not to do it all at once, which would too 
much weaken the Force of the Blood. For 
fincc it was found by feveral Inftances in 
this Experiment, that when the Force of the 
Blood 
