[ 146 ] 
which would have come on, had they neg¬ 
lected this agitation. 
The impreflions made by objects, whe¬ 
ther external or internal, upon the common 
fenfory, are affeCted by the fame caufe 
which excites motion. 
The force or energy of this fluid is al¬ 
ways proportionate to the change which the 
nerves fuftain by the impreffion of bodies. 
That the adtion of the electricity, in 
this inftance, as in all others, is determined 
invariably to certain parts without being 
difperfed or loft on others, is very eafy to 
be conceived in confequence of my dif- 
covery, viz.—That the fubfiance of the 
nerves conducts electricity very well, whilft 
their coats are very bad conductors. 
It now remains for us to confider elec¬ 
tricity under another point of view. 
Electricity is not found to refide exclu- 
fively in the mufcles and nerves. It is 
diffufed over all the body. 
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