[ 3 1 1 
:re<fcion and arangement. I was not, till lately,, 
capable of proving this by experiments, with which 
1 beg leave once more to trouble the Royal Society, 
as they much fupport the new ufes affigned to gang- 
lions, in the Effay publilhed in the LIVth volume of 
Philofophical Tranfa&ions, and defended in another 
paper publifhed in the Philofophical Tranfadtions, 
volume LVIIth, for 1767,. and open a new field of 
anatomical refearch and philofophical fpeculation, not 
without fome profpedt of advancing the practice of 
medicine in nervous difeafes, with the knowledge of 
the nervous fyftem. 
But before I proceed to relate the experiments, 
which follow, I beg leave to premife what is allowed 
by all phyfeologifts,. that when any nerve is irritated, 
the mulcle it goes to, or, if it has a large nerve, or 
bundle of nerves, all the mufcles fupplied from, 
thence, are by that irritation violently convulfed. 
If then it fhali appear, that irritation and injuries 
of the fpinal marrow, from which the intercoftal 
nerves, which fupply the heart and inteflines, truly 
arife, no lefs than the nerves diftributed to the limbs, 
occafion violent convulfions of the limbs, and yet do 
not in the lead affedl the motions of the heart, and 
inteflines, parts the moft irritable of any in the body, 
as will indeed appear to any one who repeats the fol- 
lowing experiments : 
The difference will probably, be accounted for by 
the intervention of ganglion after ganglion,, con- 
flantly found betwixt the fpinal marrow, and the 
heart and inteftines. And the unprejudiced inquirer, 
into nature will probably be led to al'cribe thofe ufes 
to ganglions, which I have done. 
Experiment'. 
