[ I2 5 ] 
To this I anfwer, that the interruption of the par- 
allel diredtion of the nervous filaments, which pro- 
bably takes place in ganglions , may intercept the 
efforts of the will, and alfo render the fenfations of 
parts wholly fupplied with nerves from ganglions , 
more indeterminate and confufed than in other parts ; 
which in fadt is the kind of fenlation proper to thele 
parts, yet without rendering fuch parts totally in- 
fenfible, which is well illuftrated by morbid cafes. 
Paralytic difeafes fhew that the nerves may be fo af- 
fedted as to become incapable of conveying the com- 
mands of the will, and yet remain l'ufficiently ca- 
pable of re-conveying fenfible perceptions. In the 
palfies which are moft frequent, the parts rendered 
immoveable by the difeafe have as quick a feeling 
as thofe that remain moveable by the will, and, what 
by the way deferves attention, are often moved in- 
voluntarily, efpecially upon the application of any 
painful Jlimulus : and it is obfervable that the paraly- 
tic limbs, which are not to be moved by our volitions, 
are often called into adtion, when the paralytic perfon 
is fuddenly thrown into fome vehement pafiion : 
juft as we obferv.e the fame caufe to produce extraor- 
dinary commotions in the heart and inteftines, &c. 
notwithftanding the will, coolly exerted, has no power 
over thefe parts. 
Various obfervations fliow that the feelings of parts 
whofe nerves come from ganglia are by no means 
acute, but blunt and confuted. We have k on the 
authority of the great Harvey, confirmed by the ex- 
periments of Baron Haller, that the heait, though 
highly irritable, is yet when touched hardly fenfible 
of it. Dr. Haller afferts that the lungs, liver, fpleen 
