' Blood would move at Icaft four times flower m the ex- 
tremities than in the great Artery. But if the propor- 
tion of the Trunk to the Branches were always 41,616 
* to <2126, which is frequently ohferved, the greateft 
Velocity of the Blood will be to the lead as 10000 is 
In his Difeourfe on Mufcular Motion, he proves that 
the Veficles of each Fibre in the a6lion of a Mufcle 
are inflated by the rarcfadion of the Blood and Spirits 
within their Cavities ; and explains the caufe of this In- 
flation and Rarefaaion from the Principles ot Attraai- 
on • And then he Ihows, by increafing the number of 
Veficles, and diminifliing their bignels, die Iwelling of 
the Mufcle may be made fo little, as to be unpercepti- 
ble and the expence of Spirits very much leffened, and 
yet’ there will be the fame degree of Contradtion in the 
Mufcle. . 1 r r , 1^1 
He then proceeds to determine the torce ot the hia- 
Ifick Fluid, and its Proportion to the weight that is to 
be raifed, according to the various degrees of Inflation : 
His Dernonftrations here are founded on the fame Prin- 
* ciples withthofe of Mr. ^ohtt Bermulli, but more eafy, 
and fuited to the Capacity of thofethat are not verfed 
in the deep parts of Geometry. 
L 0 N D 0 N: 
Printed for H. Clements^ at the Half-Moo^ in St. PauPs 
Church-yard. MDCCIX. 
