[ 35 3 
Thefe experiments feem to prove, that the Gang- 
lions on the fpinal nerves do not hinder the irrita- 
tion of the fpinal marrow frem caufing convulfions 
in the voluntary mufcles ; and that the fame Gang- 
lions, (Exp. L) do in all probability hinder that 
caufe from acting (as without their intervention it 
muff have done) upon the heart by means of its 
nerves chiefly arifing from the fpinal marrow ori- 
ginally; and therefore it feems evident, and beyond 
a plaufible conjecture, that the Ganglions on the 
fpinal nerves relate exclulively and folely to the in- 
tercoflal, or as they are otherwife called, the great 
lympathetic nerves, for the purpofes I have formerly 
endeavoured to prove : and this derives farther con- 
firmation from experiment II. as we thereby fee 
that the heart may be made to move, as all other 
mufcles may, by irritating or fqueezing its proper 
nerves below their ganglions ; and that the motions 
of the heart cannot long continue, in warm animals 
efpecially. III. after the divifion of its principal nerves, 
which fhews the dependance of the motions of the 
heart, ultimately, as that of all other mufcles, upon 
its proper nerves, and their connexion with the brain. 
