[ 55 } 
there in a Heart/ taken out of the Body, to unbend 
itfelf, or to dilate its Ventricles, after they are once 
contraded, unlefs we fuppofe fome of its Fibres to 
ad as Antagonifts to others ? 
/ 
cxxv'i. 
We have good Reafon therefore to believe that 
fome Fibres of the Heart are always ftretched out 
beyond their natural Tone, when others are con- 
traded 5 fo that, by their elaftic, reftitutive Property, , 
they do ad as Antagonifts in a certain Degree. 
CXXVII. 
In regard to the Syftole> in fuch Hearts as are 
taken out of the Body, and cut into feveral Pieces, 
we conceive, that as long as Warmth and Moifture 
remain, fo long may the athereal Matter in the 
Nerves, continue to fly into the Fibres, and con- 
trad them 5 and when it ceafes, more Warmth, or 
a gentld Impulfe (even with the Point of a Needle 
only) will revive the Motion. 
CXXVIII. 
'Hence we may, in fome meafure, difeover the 
amazing Subtilty of the nervous zyEther $ when 
fuch very fmall Sedions of the Nerves, as in the 
above-mention’d Experiment upon the Heart of a 
Flounder, fhould contain Matter fufficient for fo 
riiany Contradions. 
CXXIX. 
