C 34 1 
pofe I feleCted a very vigorous frog, and 
when prepared, laid it upon an infulated 
furface. The touch of the coating and the 
fpine excited in it very violent convuhions? 
twenty minutes after the animal ceafed to 
move, notwithftanding the application of 
the exciter. I let it reft for a few minutes, 
but this was not of any ufe; inftead there¬ 
fore of touching the fpine, I made the 
communication immediately below the 
coating with the nerves, of which I 
only touched a fmall furface ; the move¬ 
ments continued at intervals, for fome- 
what more than half an hour. 
When they ceafed to manifeft them- 
felves, it was neceflary to place the con¬ 
ductor lower down, when frefti ones were 
again excited; immobility foon fucceeded 
the fhocks, which I re-produced by carry¬ 
ing ftill lower one of the extremities of 
the conductor. When obliged to lay bare 
the nerves along the thigh, I was like- 
wife 
