1 74- fflifiettanea Curio fa. 



out taking notice of any Affiftance, that the 

 Heart receives from any other Part, except from 

 the Brain, by the means of the eight pair of 

 NerLves. 



The Accurate Boreilus, in his Oeco- 

 Part 2d. nomia Animalis y computes the Mo* 



Prop. 75! ** ve P° wer °f tne Machine of the 

 Heart to be equal to, or to furmount 

 that of a Weight of 3000/. The Obftacles to 

 the Motion of the Blood thro' the Arteries he 

 efteems equivalent to 180,000/. which is 60 

 3imes as much as he rates the Force of the 

 Heart at. Then deducting 45, 000 /. for the 

 adventitious Help of the Mufcular Elaflicl^ Coat 

 of the Arteries, he leaves the Heart with a Force 

 of 3, 000 /. to overcome a refiftance 

 Prop. 76. of 1 £5-, 000 /. that is, with 1, to re- 

 move 45*. 



This ftupendous Effect, he contents himfelf 

 to afcribe to the Energy of Percujfion. Bur, had 

 he proceeded in his Calculatin to the Veins, 

 which he allows to contain conftantly a quantity 

 of Blood, quadruple to the Contents of the Ar- 

 teries, and to which this Energy of Percujfion does 

 either not reach at all, or but very languidly, 

 he might probably have feen a neceflity for fbme 

 other Expedient to remove fb infuperable a Dif- 

 ficulty. 



But not to infift rigoroufly on the Exa&nefs 

 of this Calculation, (though the great Abilities 

 of the Author in this way, and his Ingenuity 

 and Modefty , are a fufficient Warrant for 

 the Accuracy of his Computations , and the 

 Fidelity of his Accounts) we may allow a much 

 greater Deduction, than would be juftifiable, 

 without leffening the Difficulty. But this Ac- 

 count 



