[ II ] 
Experiment I. 
My firft experiment was made on a 
frog, in the following manner: I opened 
the abdomen in order to lay bare the fpine 
of the back, and difcover the crural 
nerves which iffue from it; a few lines 
above this point, I cut the animal in two, 
and by palling my feiffars immediately 
under the origin of thefe nerves, removed 
the remaining portion of the vertebrae 
column, fo as only to leave the vertebral 
which united the bundle of nerves. Hav¬ 
ing enveloped this portion of the vertebrae 
with a piece of fheet lead, with one end 
of a metal conductor I touched the coated 
part, and with the other the furface of 
the thighs, which had been previopfly 
flopped of the Ikin. The movements 
were violent, and continued for a long 
time. By coating the nerves diftributed 
on the fore legs, I procured forne com¬ 
motions, 
