[ 6x ] 
CXLL 
Experiment I. 
Having obferved that the Ventricles of the Hearts 
of all Animals, when bled to Death, are dilated, or 
ftand wide open to a certain Size, though there 
happens to be very little Blood in them, it feems as 
if the ‘Diaftole , in a certain Degree, was the laft 
Motion of the Heart. In order to know the Truth 
of this, I open’d the Thorax of a Dog, and kept 
his Lungs playing with a Pair of Bellows, that I 
might perfectly fee the feveral Actions of the Heart 
and its Auricles. 
CXLII. 
The Auricles feem’d to me to begin the Motion, 
and the Syjlole of the Heart always inftantly followed 
that of the Auricles. Then the Apex and Sides of 
the Heart funk down, and were lengthen’d of their 
own accord, before any Blood was thrown into the 
Ventricles, from the Contraction of the Auricles 5 
for there was oftentimes more than double the Time 
taken up in the ‘Diaftole of the Heart, than the Syf_ 
tole both of the Auricles and Ventricles required. 
CXLIII. 
If I defifted from blowing frelh Air into the • 
Lungs for fome little Time, the Heart would lie 
dill, and yet I could recover its Motion again, by 
ftrongly 
