Mifcellanea Curio fa. 175 



count I have taken notice of purely for the fake 

 of the Calculation, which may be of ufe in the 

 Sequel ; the account it (elf being in other refpe&s 

 more defective than Dr. Lowers, to which 1 we 

 will return. 



J The Doctor, notwithftanding his great Saga- 

 city, appears (to mej to have overlooks fbme- 

 thing of very great moment, and importance in 

 the explication of the Action of the Heart. 

 For, tho' it fliould be granted, that the Mufiu* 

 iar Fibres of the Heart acted by the Nerves, are 

 the immediate Inftruments of its ConflriHh n or 

 Syftolc $ yet it muft not be denied, that the In- 

 tercoftal Mufcles and Diaphragm are cf great ler- 

 vice to aid and facilitate this Contraction, by 

 opening a Paflage for the Blood through the 

 Lungs, which denied would be an invincible 

 Obftacle. 



Neither do they promote it that way only. 

 The manner how they farther afllft the Heart 

 in its Contraction, will appear manifeftly, if we 

 confider the different Pofture, Situation, and 

 Capacity of the Blood-Veflels of the Lungs in 

 the leveral times of Elevation and Deprejjion of 

 the Coftce. 



The Pulmonary Artery riles from the right 

 Ventricle of the Heart, and runs in one Trunk, 

 tijl it comes to the Afrera Arteria, where it is 

 divided, and fends a Branch along with each 

 Divifion of the Afpera Arteria 7 according to 

 all the minuteft Subdivifions, of which it is 

 likewife lubdivided , accompanying all the 

 'Bronchi, in their whole progrefs through the 

 Lungs. 



The Pulmonary Vein, which empties it felf 

 into the left Ventricle of the Heart, fpread* 



it 



