[ M4 ] 
are difpofed in fuch a manner as to refufe 
a paflage to this fluid when it is directed 
upon them, it is certain that the move¬ 
ments will not take place. Nor can elec¬ 
tricity when applied to the organ itfelf, 
however ftrong it may be, produce the 
lead effed, becaufe it does not ad as a 
flimulus, but by another law, as will be 
fhewn in the fourth Sedion. 
But that the agent, which calls thefe 
organs into adion is eledricity, is demon- 
itrable both from analogy and fads. Thefe 
organs poflfefs irritability in common with 
mufcles. The irritability of the mufcles 
is mofl: powerfully excited by the animal 
eledrical fluid. It is therefore very natu¬ 
ral to conceive, that thefe organs expe¬ 
rience the fame effed. If I am not mif- 
taken, we have inconteflible proofs of this 
in the hiftory of difeafes of the nerves. 
A perfon feized with convulfions, one 
moment has very terrible Ihocks in his 
whole 
