C 6s ] 
XXXVI. 
Now this fudden Repletion, at the lame time 
that it dilates the Auricle, makes fuch an Impulfe 
upon its nervous Syftem, that an Inflation fucceeds 
in the Cells, whereby they increafe in Diameter (the 
interftitial Air now concurring by its Nifus to re- 
ftore itfelf) ; and thefe two Powers together, which, in 
performing voluntary Motions, are Antagonifts to each 
other, are now forced to become joint Antagonifts 
to the dilating Force of the intruding Fluid from the 
Vena cava , whereby the Auricle is conrra&ed, and 
the Blood driven into the neighbouring Ventricle, 
Thus is the Motion propagated from Auricle to Ven- 
tricle, and from the Ventricles to the Arteries thro* 
the whole Body, which is carried on during Life. 
xxxvn. 
And as to the Inteftines, as there can be no periftaltic 
Motion, till Deglutition is firft performed, it is carried 
on by the fame Mechanifm :For, when the firft Food is 
fwallowed, being driven into the Oefophagus , it forces 
it open, and dilates the circular mufcular Fibres be- 
yond their Tone of Reft, comprefiirig both the inter- 
ftitial Air, and the Cells of the Fibres ; which, re- 
ftoring themfelves gradually, again contract them- 
felves fucceftively downwards, till the Food is con- 
vey’d to the Stomach, and thence to the Inteftines; 
And this is alfo carried on till Death, when once 
begun. I fhall only trouble you with one fhort 
Section more, which is : 
K 
xxxvm. 
