c r,o ) , . 
Pounds of Blood in the Body, is founded on ho good 
grounds ; they fuppofing that when'an Animal bleeds to 
death, that all the Blood in the Body runs out of the 
Wound, which the Author lliews tobefalfe ; for the 
larger the Veifel that is wounded is, the Iboner mull: 
the Animal dye ^ and if tlic Aorta, it fcif were cut a-«* 
funder, there would be a iefs effufion or Blood from it, . 
than from a fmall Artery : And from this he explains the 
true reafon of tainting on any fudden or violent Eva- 
cuation, as in Bleeding in the Arm, Copping in an Af- 
cites, &c. 
By Blood he underftands not only the Fluids in the 
Veins and Arteries, but all the circulating. Liquors in 
the Body, theybdng all parts of the Blood, and fepa- 
rated from it by the force of the Heart, and many of 
them by the fame force returning again : And in order 
to eftimaie its quantity, he* fuppoles that the whole 
Body is nothing but Tubes or Velfels full of Blood or 
Liquors derived from it ; and then according to the va- 
rious proportions of the thicknefs of the Coats of the 
Velfels to their Cavities, he calculates what the quanti- 
ty of Blood mud be \ and finds, that if the Body weigh 
i6o Pounds, it mulf at lead contain loo Pound weight 
of Blood. 
He next confiders the ^^elocity, of the Blood, and 
determines it. And fird he determines the fwiftnefs by 
which it is thrown into the Aorta,, which he finds to be 
fuch as woll make it move 52 foot in a Minute; and 
becaufe the lum of the Sedion in the Branch of an - 
Artery is always greater than that of the Trunk, the 
Velocity of the Blood mud condantly decreafe as the 
Artery "branches. And according to the various pro- 
portions which the Brandies bear to the Trunk, he 
calculates the Velocity at the extremities or evanefcenc 
Arteries, and finds that if the Trunk did always bear 
the proportion to the Branches of 41616 to 43506, the 
