Dr. S. Wood of Cincinnati states, that by means of a small double
convex lens of short focus held near the eye,--that organ looking
through it at a candle twelve or fifteen feet distant,--there will be
perceived a large luminous disc, covered with dark and light spots and
dark streaks, which, after a momentary confusion, will settle down
into an unchanging picture, which picture is composed of the organs
or internal parts of the eye. The eye is thus enabled to view its own
internal organisation, to have a beautiful exhibition of the vessels of
the cornea, of the distribution of the lachrymas secretions in the act
of winking, and to see into the nature and cause of _muscæ volitantes_.