ly in
the evening, in an outward and upward direction, an appearance
of dark blue, violet, and red colors; these colors became
gradually less intense, were shaded into bright orange, yellow,
and green, which latter colors alone eventually remained, and in
the course of five weeks disappeared entirely. As soon as the
intolerance of light had so far abated that the patient could
observe an object without pain, and for a sufficient time to
gain an idea of it, the following experiments were made on
different days.

"_First Experiment._--Silk ribbons of different colors, fastened
on a black ground, were employed to show the complementary
colors. The patient recognized the different colors, with the
exception of yellow and green, which he frequently confounded,
but could distinguish when both were exhibited at the same time.
He could point out each color correctly when a variety was shown
him at the same time. Gray pleased him best; the effect of red,
orange, and yellow was painful; that of violet and brown not
painful, but disagreeable. Black produced subjective colors, and
white occasioned the recurrence of _muscae volitantes_ in a most
vehement degree.

"_Second Experiment._--The patient sat with his back to the
light, and kept his eye closed. A sheet of paper on which two
strong black lines had been drawn, the one horizontal, the other
vertical, was placed before him, at the distance of about three
feet. He was now allowed to open the eye, and after attentive
examination he called the lines by their right denominations.
When I asked him to point out with his finger the horizontal
line, he moved his hand slowly, as if feeling, and pointed to
the vertical; but after a short time, observing his error, he
corrected himself. The outline in black of a square [six inches
in diameter], within which a circle had been drawn, and within
the latter a triangle, was, after careful examination,
recognized and correctly described by him. When he was asked to
point out either of the figures, he never moved his hand
directly and decidedly, but always as if feeling, and with the
greatest caution; he pointed them out, however, correctly. A
zigzag and a spiral line, both drawn on a sheet of paper, he
observed to be different, but could not describe them otherwise
than by imitating thei