A Conjefturc at the Quantity of Blood in Men^ to- 
gether with an Ejiimate of the Celerity of its Circu- 
lation. By Allen Moulin M. D. Keg. Soc. S. 
IN 2i Sheep weighing alive ii8A we found but 5/. ^of 
Blood which is but of che weight of the Sheep. In 
a Lamb weighing jo/. \ when living, there was but i\L 
of Blood which is nearly a 70 th. part. 
In a Diick weighing alive 2/. 14 Ounces 50 gr. we 
found an ounce a half and 5:^ gr. of Blood, which is iefs 
than a 2%th. of the whole weight of the living Duck» 
In a Rabbit weighing io Ounces, 7 Dr. and 50, gr. we 
found 2 Dr. 57 gr. of Blood, which is about a 30/^. Part* 
In the right Ventricle and Auricle of the Heart of a 
Dogy I found 6 ounces of Blood, after that I injetted into 
the jugular Vein a Liquor that coagulated the Blood. I 
found a greater quantity of Blood in the Heart of another 
Dogj whom I treated after the fame manner. The Hearts 
were much diftended by the Blood found in them. I fhall 
therefore fuppofe that 4 ounces only were received at a 
time by thefe Hearts without force, that is naturally : And 
leaft I fliould fuppofe a greater quantity of Blood to be ad- 
mitted at a time than really is, I will fuppofe a Mans 
Heart which is much larger, (and has much larger VelTels 
than thofe I fpeak of ) to receive but 4 ounces at each 
Diaftole. Allowing 75 Pulies to every Minute, there will 
be 4500 in an hour, and 18000 ounces of Blood tranfmit- 
ted in that time. This laft Number is the Produft of 
the foregoing 4500, being multiplyed by 4, the Number 
of Ounces at a Diajiole. 
Now 
