[ 6? ] 
Spafms, if partial } if total, an Epilepfy ? Painful 
Cramps are occafioned by the Inflation of fome of 
the mufcular Fibres, while others are not afFeded in 
the fame Mufcle* and an unequal Drag or Con- 
traction is painful, when a total one is more tole- 
rable. 
XL. 
And as to the Decay of a Limb, it does not feem to me 
to happen from the Want of a nervous Juice, by way 
of Nourifhment, as has been the common Opinion > 
but becaufe, whether they be Mufcles of voluntary 
or involuntary Motion, the inflating Matter not 
being able to reach the Cells, from an Obftrudion 
in the Roots or any other Parts of the Nerves, fo as 
to fill them up to an <iy£quilibritm with the inter- 
ftitial Air, this Air will expand itfelf beyond its Me- 
dium, and comprefs the little Twigs of the parallel 
arterial Canals , that go off to nourifh the Cells of the 
mufcular Fibres, and lie conftantly upon them, and fo 
flop their Nutrition from the Blood ; while the pa- 
rallel Canals themfelves, being too confiderable to 
be afFeded by the Preflure of the interflitial Air, con- 
tinue on their Stream : Thus a Decay of the Limb, 
and Lofs of Motion, is effeded, while there is a Cir- 
culation continued thro’ the Body of every Mufcle in 
the Limb. 
XLI. 
The Hearts of certain Animals, taken out of the 
Body, will continue to move a confderable Time, 
becaufe the Adion and Re-adion cannot ceafe at 
K 2 . 
once 
