DOI Page / Citation link:
https://doi.org/10.11588/diglit.1274#0140
144
within the Eyes ; and in them that perception is occa-
sioned which we call Seeing.
The figure of the Eye is rather orbicular. The fore
part consits of several humours, perfectly pellucid, and
these are divided by membranes as transparent.
Beneath, covering the whole interior surface, is an ex-
pansion of the fineft nerves, and of sensibility so extraor-
dinary as to feel a single ray.
Behind this delicate net-work is placed a membrane,
coloured with black, to prevent rays from passing, or
any reflection of rays.
Nothing can be visible but by Light. Light is an
essential and powerful body ; it is formed of rays, each
ray always passing in a direct line, diverging from the
luminary, unless it be diverted.
These rays striking on objects, are reflected from
them in all directions, and in such proportion and qua-
lity as is agreeable to their respective properties.
In the fore part of the Eye is an opening, to admit
these rays reflected from objedls around. By its figure
it affords entrance into the Eyes to all the rays that are
reflected towards them in a fit direction, within the space
of 180 degrees.
These rays having passed through the opening, form
themselves in order on the expansion of fine nerves, and
within the Eyes ; and in them that perception is occa-
sioned which we call Seeing.
The figure of the Eye is rather orbicular. The fore
part consits of several humours, perfectly pellucid, and
these are divided by membranes as transparent.
Beneath, covering the whole interior surface, is an ex-
pansion of the fineft nerves, and of sensibility so extraor-
dinary as to feel a single ray.
Behind this delicate net-work is placed a membrane,
coloured with black, to prevent rays from passing, or
any reflection of rays.
Nothing can be visible but by Light. Light is an
essential and powerful body ; it is formed of rays, each
ray always passing in a direct line, diverging from the
luminary, unless it be diverted.
These rays striking on objects, are reflected from
them in all directions, and in such proportion and qua-
lity as is agreeable to their respective properties.
In the fore part of the Eye is an opening, to admit
these rays reflected from objedls around. By its figure
it affords entrance into the Eyes to all the rays that are
reflected towards them in a fit direction, within the space
of 180 degrees.
These rays having passed through the opening, form
themselves in order on the expansion of fine nerves, and