1 8 a Mifcellanea Curiofa. 



mination of motion, than their own weight wou'd 

 give them, the contain'd Fluids muft be Cotm* 

 terpoifes to each other. For the Veins and 

 Arteries being join'd at the fmaller Extremities, 

 and the larger of both terminating in the fame 

 parallel Line, it is impoffible, according to the 

 Laws of Hydroftaticks* that the contents of either 

 fliou'd overbalance t'other. How far then muft 

 it fall fliort of forcing the natural Power and 

 Refiftance of Co ftronga Mufcle as the Heart, by 

 meer Gravitation ? 



The Blood indeed has a Progrejfive Motion 

 through its Veflels, wherein it differs from Wa- 

 ter, in a recurve Tube, in the Experiment a- 

 bove-ftated. But, if the natural Gravitation of 

 the Blood contributes nothing to the Dilatation 

 of the Heart, this progreffive Motion will not 

 not be found much more fufficient. For, as this 

 Motion is deriv'd intirely from the Heart's Con- 

 flri&ion ( as all Accounts hitherto derive it ) 

 cou'd the Blood be fuppos'd to re-a£t. upon it by 

 the Heart, with all the force firfr. imprefs'd up- 

 on it by the Heart, it would be mfufficient, unlefi 

 we will fiippofe the Force ccmmunicMed to be fu- 

 periour to the Power Communicant, which is ab- 

 ford. 



But when the juft and neceffary Deductions 

 for the Impediments, which the Blood meets 

 with in its Progrefs through the Veflels, (hall be 

 made, the remaining Force will be found fb 

 exceeding weak, that to prop the Blood through 

 the Veins may be a task alone too great for fb 

 fmall a Power, without charging it with the 

 additional difficulty of forcing the Mufcle of the 

 Heart, 



Alphonfus 



