Chapter XVIII.—Concerning Sensation. Sensation is that faculty
of the soul whereby material objects can be apprehended or
discriminated. And the sensoria are the organs or members
through which sensations are conveyed. And the objects of sense
are the things that come within the province of sensation. And
lastly, the subject of sense is the living animal which
possesses the faculty of sensation. Now there are five senses,
and likewise five organs of sense. The first sense is sight: and
the sensoria or organs of sight are the nerves of the brain and
the eyes. Now sight is primarily perception of colour, but along
with the colour it discriminates the body that has colour, and
its size and form, and locality, and the intervening space and
the number 1834 : also whether it is in motion or at rest, rough
or smooth, even or uneven, sharp or blunt, and finally whether
its composition is watery or earthy, that is, wet or dry. The
second sense is hearing, whereby voices and sounds are
perceived. And it distinguishes t