[ I5» 1 
circulation of condenfed eledricity afford 
a better folution of thefe phenomena? 
If it fhould be objeded by any one that 
the circulation only takes place when two 
coatings ire employed, I would afk the 
reafon, why the movements take place 
when there is only one coating ? and why 
in this cafe, there fhould be a neceflity for 
a con dud or of a different fort of met’a! 
from the coating. 
A very fmall quantity of artificial elec-' 
tricity is fufficient to excite motion in 
frogs, when applied to the nerves. 
This portion of the author is certainly 
true. Five or fix degrees of eledricity 
meafured with the condenfer in a very 
fenfible eledrometer, in his experiments 
produced evident effeds. It fhould feem 
to be the intention of the author to prove, 
by means of this fad, that the eledricity 
of the metal, although trifling, is capable 
of producing the phenomena in queflion. 
This criterion does not however appear 
to 
