[ 2lS ] 
5th, The electricity difcharged by the 
nerves, is a caufe fufficient to produce the 
effeCt fought for. 
6th, Some experiments, as for inftance, 
that of the learned Cigna with filken rib¬ 
bons, prove that electricity may exift 
naturally in fubftances in the two oppofite 
ftates. 
One might eftablifh a theory upon more 
folid grounds, were one acquainted with 
the ultimate ItruCture of thefe organs, and 
all the laws of the eleCtrical principle, but 
being deftitute of thefe advantages, and 
proceeding with unaffured fteps, it is much 
to be doubted whether I have feized the 
truth. 
It may be alked, whether an examina¬ 
tion of the motions of every organ in par¬ 
ticular, would conduCt us farther in the 
difcovery ? It appears to me, that it 
would produce a contrary effeCt, and em- 
barrafs our imagination ftill more. We 
fhould 
