C 30 ] 
Received November 9, 1769. 
IV. Experiments in Support of the Ufes 
aferihed to Ganglions of the Nerves , in 
Philofophical Tranfa&ions, V ol. LIV. 
and VoL LVIL by James Johnftone, 
M. D. 
Read at R. S. T ~T A V I N G before had the honour 
Feb. i> ijjQ. having my thoughts on the ufes 
of ganglions, which hitherto had remained an un- 
folved problem, read to the Royal Society ; it was 
obferved that a principal, and indeed almoft the only 
objection of any weight, to which the dodlrine was 
liable, arofe from the indifputable fadl, That each 
pf the nerves arifing from the lpinal marrow had a 
ganglion. 
The concurrence of argument in favour of the 
general do&rine perfuaded me, that thefe ganglions 
of the fpinal nerves refpedted exclulively the fila- 
ments which are detached from the fpinal nerves to 
the great lympathetic nerves, a new contexture taking 
place in thole ganglions capable of intercepting the 
ufual powers of volition : and that thofe filaments 
diftributed to the voluntary mufcles, underwent no 
Inch change from their ufual redilineal and parallel 
direction 
