— 310 —
      §26. The little Bodies that compose that Fluid, we call Water,
are so extremely small, that I have never heard of any one, who by a
Microscope, (and yet I have heard of some, that have magnified to
10000; nay, to much above 100,000 times,) pretended to perceive
their distinct Bulk, Figure, or Motion: And the Particles of Water
are also so perfectly loose one from another, that the least force
sensibly separates them. Nay, if we consider their perpetual motion,
we must allow them to have no cohesion one with another; and yet
let but a sharp cold come, and they unite, they consolidate, these
little Atoms cohere, and are not, without great force, separable.
He that could find the Bonds, that tie these heaps of loose little
Bodies together so firmly; he that could make known the Cement,
that makes them stick so fast one to another, would discover a
great, and yet unknown Secret: And yet when that was done, would
he be far enough from making the extension of Body (which is the
cohesion of its solid parts) intelligible, till he could shew wherein
consisted the union, or consolidation of the parts of those Bonds, or
of that Cement, or of the least Particle of Matter that exists. Where-
by it appears that this primary and supposed obvious Quality of
Body, will be found, when examined, to be as incomprehensible, as
any thing belonging to our Minds, and a solid extended Substance, as
hard to be conceived, as a thinking immaterial one, whatever difficulties
some would raise against it.
Locke Hum II, 23, §26, p. 310