[ 9 ] 
This experiment fucceeded with all me¬ 
tallic bodies, but more particularly well 
with filver; non-condudting fubflances 
were not proper for it. From this period, 
our author began to fufpedt the animal 
poftefted an eledtricity of its own, and in 
this fufpicion he was farther confirmed by 
the following circumftance :■—he held a 
prepared frog by a hook with one hand, 
fo as to let its feet reft upon the bottom of 
a fmall filver cup, which he happened 
unintentionally to ftrike with the other; 
at the inftant, the body of the animal 
fell into violent convulfions. If one per- 
fon held the prepared frog, and another 
touched the cup, no movements were ex¬ 
cited. The Profefifor being now aware of 
the neceflity of a communication, under¬ 
took a feries of experiments for the far¬ 
ther inveftigation of this fubjedt. He 
firft placed a prepared frog upon a non¬ 
conducting furface, and brought one end 
Of 
