First, then, There are some which come into our minds by one sense
only.
Secondly, There are others that convey themselves into the mind by
more senses than one.
Thirdly, Others that are had from reflection only.
Fourthly, There are some that make themselves way, and are suggested
to the mind by all the ways of sensation and reflection.
We shall consider them apart under these several heads.
Ideas of one sense. There are some ideas which have admittance
only through one sense, which is peculiarly adapted to receive them.
Thus light and colours, as white, red, yellow, blue; with their
several degrees or shades and mixtures, as green, scarlet, purple,
sea-green, and the rest, come in only by the eyes. All kinds of
noises, sounds, and tones, only by the ears. The several tastes and
smells, by the nose and palate. And if these organs, or the nerves
which are the conduits to convey them from without to their audience
in the brain,- the mind's presence-room (as I may so call it)- are any
of them so disordered as not to perform their functions, they have
no postern to be admitted by; no other way to bring themselves into
view, and be perceived by the understanding.
The most considerable of those belonging to the touch, are heat
and cold, and solidity: all the rest, consisting almost wholly in
the sensible configuration, as smooth and rough; or else, more or less
firm adhesion of the parts, as hard and soft, tough and brittle, are
obvious enough.
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