'And
to us it is enough that gravity does really exist,
and act
according
to the laws which we have explained, and abundantly
serves
to
account for all the motions of the celestial
bodies, and of our
sea.
'And
now we might add something concerning a certain
most subtle
Spirit
Spirit
which pervades and lies hid in all gross bodies; by
the force and
action
of which Spirit the particles of bodies mutually
attract
one
another
at near distances, and cohere, if contiguous; and
electric
bodies
operate to greater distances, as well repelling as
attracting the
neighbouring
corpuscles; and light is emitted, reflected,
refracted,
inflected,
and heats bodies; and all sensation is exited, and
the
members
of animal bodies move at the command of the will,
namely
by
the vibrations of this Spirit, mutually propagated
along the
solid
filaments
of the nerves, from the outward organs of sense to
the
brain,
and from the brain into the muscles. But these are
things
that
cannot
be explained in a few words, nor are we furnished
with that
sufficiency
of experiments which is required to an accurate
determina-
tion
and demonstration of the laws by which this elastic
and electric
spirit
operates.'
NEWTON
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