C 472 ] 
much further the effed might be thus divided and 
fubdivided into different channels, was not deter- 
mined; but it was found to be proportionably 
weakened by multiplying thefe circuits, as it had 
been by extending the Angle circuit. 
Something may be expeded to be faid of the 
parts of the animal immediately concerned in pro- 
ducing the eledrical. effed. The engraving, which 
accompanies this letter, while it fhews the ge- 
neral figure of the Torpedo, gives an internal 
vview of his eledric organs. The Society will, 
befides, have a full anatomical defcription of thefe 
parts from the ingenious Mr. John Hunter, in a 
paper he has exprefsly written on the fubjed at 
my requeft. It would therefore be fuperfluous 
; for me to fay any thing either in regard to their 
; fituation or ftrudure. 
T have to obferve, however, That in thefe 
double organs refides the eledricity of the Tor- 
pedo, the reft of his body appearing to be no 
otherwife concerned in his eledrical effed than 
as conduding it : That they are fubjed to the 
• will of the animal j but whether, like other double 
parts fo controlable, they are exercifed, at times, 
fingly as well as in concert, is difficult to be af- 
certained by experiment: That their upper and 
.under furfaces are capable, from a ftate of equi- 
librium with refped to eledricity, of being in- 
ftantly thrown, by a meer energy, into an oppo- 
fition of a plus and minus ftate, like that of 
t the charged Phial : That, when they are thus 
.. charged, the upper furfaces of the two are in 
v the fame ftate of eledricity; as are the under 
a furfaces 
