IMPROVED. 51 



fe.irch after Truth, was the grand Caufe of their 

 dirk and abllrufe Reafonings. 



Now, having the Number of Pulfes in any de- 

 terminate Time, the Quantity of Blood thrown out 

 at the left Ventricle of the Heart every Pulfe, and 

 the Diameter of the Joria or great Artery arifing 

 :: from the Heart ; I fay, thefe Things being known, 

 it will be eafy to find with what Degree of Celerity 

 the Blood moves through the Jorta. For, " the 

 *' Celerity with which a Fluid runs out at any 

 *' Orifice, uniformly and always running in the 

 *' fame Quantity, is equal to the Velocity of a 

 *' Body which defcribes a Space of the fame 

 " Length with that of a Cylinder whofe Bafis 

 *' IS equal to the Orifice, and whofe Magnitude 

 *' is equal to the Quantity of Fluid that runs out 

 *' in the fame Time ;'* And this Theory might be 

 yet farther illuftrated, but my Time, as well as 

 I Room here, will not permit me to fay much more 

 about this Matter. However, I muft not omit one 

 Thing, becaufe moft Farriers are fo very ignorant, 

 Ithat they hardly know the Difference between a 

 Vein and an Artery, but call them all in general 

 Veins, notwithftanding it is of the greatefi: Concern, 

 for the Cure of Difeafes, to have a perfeft Know- 

 ledge of Anatomy. I fay then, that the Sum of 

 the Seftions of the Branches of an Artery, is always 

 jgreater than that of the Trunk or Body of it ; and 

 iconfequently the Velocity of the Blood mufl always 

 liecreafe, as the Artery divides into more Branches, 

 jind is by Experience fhewn to do fo as 5233 is t() 

 IJ^j or tiie Blood moves 5233 Times flower in feme 

 capillaries or very fmall Branches of an Artery, 

 han it does in the Jorta or great Artery. The 

 31ood is received from the Extremities of the Arte- 

 les into the Veins, where it flill moves flower as it 

 eturns to the Heart again. 



The Arteries are to the Veins as 324 to 441, and 

 onfequently the Blood moves in the Veins above 

 '1 16 Times flower, in Man, than it does in the 

 D 2 JorU 



