t I3J ] 
although their office be the fame. But to 
be perfedtly aware of this difference, it is 
neceffary to confult the very complete ana¬ 
tomical account given by Mr. Hunter in 
the Philofophical Tranfadtions, vol. lxiii. 
Ixv. from whence the preceding extradts 
have been taken. 
If we were acquainted with the eledtri- 
cal organ of the filurus, which Mr. Brouf- 
fouet calls “le Trembleur,” and that of 
the fifli Mr. Paterfon fpeaks of in a 
letter to Sir Jofeph Banks, Philof. Tranf¬ 
adtions, vol. Ixxvi. and of all the hitherto 
unknown fifties, we fhould certainly fee a 
difference of ftrudlure, which would ren¬ 
der the analogy between thefe organs 
and the muffles ftill more evident and 
linking. 
The muffles are compofed of feveral 
fmall bundles or fafficuli. Thefe fafci- 
culi confift of cylinders or parallel fibres, 
ffhe fmalleft of thefe fibres is divifible into 
K 4 an 
