MifceUane$ Curloja. 1 8 5 



(a Misfortune that has befallen him in divers 

 other Particulars) his Theory holds ftill good. At 

 lead it ought to be allow'd, in juftice to- his great 

 Abilities and Exadtnefs, till fbme Body convicts 

 him of fome material Error in his Calculations, 

 which has not as yet been done by any Body, 

 that I know of. 



Suppofing then the force of the Heart, and of 

 the Mufcular Coat of the Arteries, as like wife of 

 the refiftance, which they muft overcome, to be 

 computed with any degree of accuracy, there re- 

 mains yet fuch a prodigious difproportion to be ac- 

 counted for, as requires feme more powerful Agent, 

 than any yet afiign'd, to make up the deficiency. 



What aliiftance the Heart receives from the 

 action of the thorax towards the facilitating its 

 Contraction, without which afiiftance there cou'd 

 have been no Syftole, has been already (hewn. 

 But neither the Intercoftal Mufcles, or Diaphragm^ 

 which are fo inftrumental in that part of its 

 action, can contribute any thing to the Diaftole^ 

 becaufe they ferve only' to enlarge the Cavity of 

 the Thorax^ and thereby to open a pafTage to 

 the Blood from the . Heart, and promote its Con- 

 lfriction. 



Whatever therefore the force is, that dilates the 

 Heart, and is the.caufe of the Diaflole, it mull: be 

 equal to that of the Heart, the tntercoflal Mufcles 

 and Diaphragm }, to all which it acts as an Antago- 

 nift. I take no notice of the Serratus Major An- 

 ticus, and other Mufcles ; which have an obfcure 

 (hare in the Elevation of the 'Cpfia, becaufe as 

 much may reafonably be deducted upon the ac- 

 count .of. the Obliquus externus. Abdominis^ and 

 other Mufcles ; which having their Infections on 

 fome of the lower $jbs 9 are as inftrumeptal 



towards 



