[ 5<?3 1 
If it be objefted that no wound of a Nerve is nior 
tal, and if the Spirit did not conduce to the motion of 
the Heart, the Dog would not fo foon dye. MonC 
Chirac thinks it fufficient that the Lungs are inflamed, . 
and the Animal^ feized with an acute" Fever , which 
muff neceffarily^happen in this cafe, becaufe the Nerves 
of the Heart and chofe of the Lungs are contained in 
the fame (heath, and wiien tliey are cut afunder, the 
Lobuli x)i the Lungs muff fink, and the circulation of 
the Blood thro them be intercepted. 
The Author purfuing his Enquiry, in the next place 
excludes the Blood difcharged into the Heart from the 
Vena Cava, ^nd the Pulmonary Vein from the office of 
fupplying thefe Motive Spirits 3 for if a Ligature be 
made on thefe Veffels, the Heart, after its Ventricles 
are evacuated, will neverthelefs perfift to contrad it- 
felf ; And for this and other Reafons, the Coronary 
Art^ry^ is incapable of any fuch Function. Having 
thus reafoned at large, and enumerated all the ways 
he thinks poffible the Heart fhould be contraded, he 
concludes at laft there mufl: be in theHearc itfclf certain 
Colatories and Treafuries, in which this Motive Fluid 
is feparated and lodged, as the Animal Spirits are in 
the Brain. That in the time of Adion, it is transfufed 
out of thefe Store-hoiifes into the Cells and Interftices 
of the Fibres of thf^ Heart, which it- contrads in a 
moment : Daring the Syjiole he fuppofes the Colatories 
fuffer an alteration of their figure, and the paffiiges be- 
ing ftopt and clofed by the fwelling of the Fibres, 
there cannot be any new Influx of Spirits, and fo the 
Heart yields. to the force which dilates it^ which is the 
fuhjsd of the next Enquiry. 
The Dilatation of the Heart cannot proceed from 
any external preflure. The Lungs fiilei wirh Air, the 
Pericardium, the Liquor contained in this Bag, the 
Membrane which invellrs the Heart, ar^ all infutfi- 
U u u u cient 
