[ 54 ] 
through flame, before it could poflibly 
injure the limbs of the frog, and it did 
not occaflon any irritation. But the frog 
was extremely powerful when it had not 
this obftacle to furmount. 
May 1 trefpafs upon the patience of my 
readers, with one word more upon conduc¬ 
tors? Amongftmen, there are feme indi¬ 
viduals who are good condudtors, others 
who are lefs fo, and fome again who appear 
to be almofl: non-condudtors. 
I was one day carrying on, with three 
of my friends, fome experiments upon 
frogs. A frog was put in water, and we 
each by turn eflayed its power. Two of us 
excited flrong convuliions, the third only 
feeble ones, and the fourth none at all. 
This experiment was repeated frequently 
with the fame refult. This is not the only 
example I could adduce of the reality of 
this fadt, but I do not think it neceflfary 
to dwell any longer upon it. 
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