[ 237 3 
of the experiments did the nerves under 
the incillon recover their powers; yet the 
nerves under the inciflon feemed at the 
end of that period, as large in the limb 
in which the experiment was made, as 
they were in the found limb. (Loc. cit.) 
Monro obferves alfo, that the fubflance 
of the nerves is not only medullary, but 
that it is mixed with a eineritious matter, 
which is furnifhed to them by the pia 
mater, and that it is from this membrane 
and from its veffels, that independently of 
the brain, they derive the energy and the 
principle of life which they poffefs. 
Thus the great quantity of blood which 
goes to the brain, does not appear dedined 
for the general fecretion of the neryous 
fluid, but for the purpofe of furnifhing 
materials for the prefervation of fo large 
a mafs as thebrain. 
It is however probable that the blood*, 
veffels may have another office, viz. that 
of feparating the ele&ricai fluid in the brain 
( b y 
