[ 3i 4 1 
peat what has been faid in the article of 
fecretion, viz.—That they aCt by means 
of a matter, the fubtilty and velocity of 
which are exceeding great, and that this 
matter can only be electricity. If, inftead 
of eleCtricity, we fhould fubftitute any 
other known agent, we ihould have to 
encounter infurmountable difficulties in 
the explanation of the feveral phenomena. 
If any one ffiould fuppofe a particular fluid, 
we ihould aik him to demonflrate it. It 
is demonftrated, he might anfwer, by its 
effeCts. Let him then analyfe thefe efteCts, 
and he will difcover, in fpite of every pre¬ 
judice, the exiftence of a matter identical 
with electricity. 
In the foregoing obfervations I have en¬ 
deavoured to determine both the quality of 
the nervous fluid, and its influence in the 
government of the animal economy ; thefe 
two objeCts appearing to me as the bails 
of 
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