[ 172 ] 
Let us recall to mind, that having made 
a ligature upon a nerve, and eftablifhed a 
communication above this point between 
the coating and nerve, the frog fell into 
convullions; and that when the ligature 
was placed in contact with the mufcles, 
all motion ceafed. 
Let us likewife recoiled!, that when the 
ligature is at the leaf! diffance from the 
mufcles, a very fmall quantity of artifi¬ 
cial electricity is enough to put frogs in 
motion, and that a ftrong charge fs ne- 
ceflary to produce the fame effedt when the 
ligature touches the mufcles. 
As the ligature is conftantly the fame, 
and as we do not make any alteration in 
the constitution of the nerves, their man¬ 
ner of feeling mull remain therefore the 
fame, whether the ligature does or does 
not touch the flefh, 
% 
Thus it is as evident as poflible, that 
the difference of the refult is owing to the 
circum- 
