[ 5 * ] 
CXVII. 
3 dly. Does not the ‘Diaftole of the Heart depend 
upon an Abatement of the Tenfionin the contracted 
Fibres ; a Motion of Reftitution in fuch as are 
over ftrccched. 5 and the Influx of the Blood con- 
junctly X 
cxvm. 
Without fome fuch Mechanifm as this, no Power 
that we know of, belonging to the animal Oeco- 
nomy, would be able to caufe the c Diaftole of the 
Heart : But if fuch a Structure, as is above-mention'd, 
could be proved, no more ‘Difficulty would attend 
the Explication of it than that of the voluntary 
Mufcles. 
1 ' 
CX 1 X. 
In directing the Heart we find a great many different 
Orders or Series of Fibres, vatioufly contorted, and 
running in contrary Directions 5 fo that, for ought 
we know, it may be an Epitome of mufcular Con- 
ftruction in general. 
cxx. 
We may here obferve what Care Nature has taken 
to prevent too great a Dilatation in the 'Diaftole of the 
Ventricles, the right one efpecially, as being the weak- 
en, by forming the TaplU, 01 Column#, which run 
from 
