[ 64 ] 
• .... ? * 
,, . . . 
CXLIX. 
Dr. Hales * injected the left Ventricle of the 
Heart of an Ox from a Column of melted Wax 
4^ Feet high, which diftended the Capacity of it to 
12. j. cubic Inches. Now fuppoling the Impulfe of 
the refluent Blood to be equal to a Column of 
melted Wax 4-j Feet high, and that in every Hia- 
ftole> whilft the Ox was alive, the left Ventricle was 
diftended to the Capacity of 12. y. cubic Inches, 
yet we may obferve that the Heart, immediately after 
each Syjlole, relaxes and dilates its Ventricles to a 
certain Degree, by its own Mechanifm, and to 
whatever Capacity the Ventricles are afterwards di- 
lated, it muft neceflarily proceed from the Impulfe 
of the Blood only* all which is perfectly agreeable 
to our third Query, viz. that the T)iaftole of the 
Heart may depend upon an Abatement of the Ten- 
lion in the contracted Fibres, a Motion of Reftitu- 
tion in fuch as are over-ftretched, and the Influx of 
the Blood conjun&ly. 
CL. 
Experiment III. 
I took the Heart out of a live Viper, and placing 
it upon a Piece of writing Paper, I found it beat 
at 
* Hiemaftatice, fag, 25. 
