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O B S E R V A T I O N S ON THE
I'datic nerve has been cut, has its minute velTels aduatcd by an energy
which may, ftriflly fpcaking, be called nervous, and which feems to be analogous
to the energy which operates on the parts of thofe animals, for initance,
the echinus marinus, in which I have not found any organ refembhng
our brain, or is, perhaps, Hke to the energy by which the parts of the
vegetable kingdom are adluated.
6. In confequence of this idea, we Diould, in palfy, and other difeafes
of the nervous fylliem, not confine our attention entirely to the ftate of the
encephalon, the fuppofed fole origin of the nerves, but ought to attend to
the ftate of circulation in the limbs affeded.
C H A P .
N E R V O U S S Y S T E M . 37
C H A P T E R X I I .
[ A V I N G confidered the general texture of the brain, cercbellum,
and fpinal marrow, and endeavoured to fliow that the nerves are not
only covered with the pia mater, but that it furnilhes t'o them, in their
whole progrefs, a cineritious fubftance and nervous energy; and further,
that the pia mater is not laid afide in the retina, or within the cochlea, nor
at the extremities of the nerves in general, as has been univerfally fuppofed
by authors, I fliall proceed to give a particular defcription
O f the APPEAIIANCE of the NERVES i n thei r COURSE ;
O f d i e NATURE of their PLEXUSES ;
O f the STRUCTURE o f NERVOUS GANGLIA;
O f certain SPHEROIDAL BODIES c o n n e d e d wi t h the BRAIN and NERVES
o f fome ANIMALS.
C H A P .