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Each column is divided by horizontal partitions, 
placed over each other, at very fmall diftances, and 
forming numerous interftices, which appear to con- 
tain a fluid. Thefe partitions conflfl: of a very thin 
membrane, conflderably tranfparent. Their edges 
appear to be attached to one another, and the whole 
is attached by a fine cellular membrane to the infide 
of the columns. They are not totally detached from 
one another : 1 have found them adhering, at diffe- 
rent places, by biood-veflels paffing from one to 
another. 
The number of partitions contained in a column of 
one inch in length, of a Torpedo which had been 
preferved in proof fpirit, appeared upon a careful ex- 
amination to be one hundred and fifty : and this 
number in a given length of column appears to be 
common to all fizes in the fame ftate of humidity, 
for by drying they may be greatly altered ; whence 
it appears probable that the increafe in the length of 
a column, during the growth. of the animal, does not 
enlarge the diftance between each partition in pro- 
portion to that growth ; but that new partitions are 
formed, and added to the extremity of the column 
from the fajcia. 
The partitions are very vafcular ; the arteries are 
branches from the veins of the gills, which convey 
the blood that has received the influence of refpira- 
tion. They pafs along with the nerves to the elec- 
tric organ, and enter with them; then they ramify, 
in every direction, into innumerable fmall branches 
upon the fides of the columns, fending in from the 
circumference all around upon each partition fmall 
arteries,. 
