1 78 Mifcellmea Curio fa. 



ter, the Enlargement or Expanfion of the Cha- 

 nels of the Artery anfwering the drawing of the 

 Embolum, as the conftriclive motion of the Muf- 

 cle of the Heart does the preffure of the Atmof- 

 fhere upon the Surface of the Water, the one 

 making way for the fluid, and the other forcing 

 k to follow, where the refiftance is leaft. Jn this 

 Senfe we may allow a fort of Attraction to the 

 Pulmonary- Artery, depending wholly upon the 

 Action of the Intercoftal Mufcles and Diaphragm, 

 which we mull therefore confeft to be very Ser- 

 viceable and instrumental in promoting the Syflole 

 of the Hearr. 



But if the Learned Author be deficient in his 

 Account of the Syftole ; that is, if he has not 

 obferv'd all the Mechanifin and Contrivance of 

 Nature for the Contraction of the Heart ; much 

 lefs fufficiently has he accounted for the Dia- 

 flole, or Dilatation of ir, which he afcribes to a 

 motion of J\eftitution of the over-ftrain'd Fibres, 

 which yet he confeffes are made for Conftri&ion 

 only. 'Tis true, he immediately after joins the 

 Influx of the Blood as a concurrent Caufe ; but 

 from the flight notice that he rakes of it, 'tis 

 plain, that he did not fo much as dream of any 

 great (hare ir had in that Action. His Words 

 are thefe : 



Quin (3 (ut obiter hoc tnoneam) 

 De Corde 9 Pag. omnis motus contract tone perficiatur, 

 75. $ Cordis VibrdL ad conftriBionem 



folum fat~l£ fint 9 apparet quoque 

 Cordis motum totum in Syftole pofitum ejfe \ cumr 

 que Fibra ultra tonum fuum in omni conftri&ione 

 ejus tendantur 9 idcirco ubi nixus ifte abfolvitur, mo- 

 at quafi reftitutionis Cor itcrum reltxatur, & {an- 

 guine 



