Dr. Reuben on ing Blood-corpuscles within the Retina. 835 
the eyes ; and plainly thus discovered, not as moving in, but as 
emerging into the field of view. This spot seemed, with two eyes, 
a little to left of the axes of vision; and from it several streams 
arose. (Query: the termination of the arteria centralis, or of one 
of its large branches ? 
—Looking with but one eye, this point of ingress seems very 
near the axis of vision; and sometimes there is the appearance 
to be named in the next paragraph. 
' t—Looking to the west, clear sky, soon after sunset; through 
red glass; some few moving points; but chiefly, in the axis of 
view, a continual influx of a small stream of very small bead-like 
objects, faint, but real; seeming to move only into the field, and 
to disappear almost at once through it; not spreading out in it. 
This appearance I had noticed first of all with a violet glass; 
and with violet, red, or blue, it was often repeated. By shifting 
the eye, the movement could be made to occur apparently up- 
ward, or to one side; but it seemed to return usually to the 
downward course. I distinguished this as the cascade. The 
uniform movement seemed to forbid the supposition that this 
could be the appearance of the corpuscles in the artery; and 
hence, its explanation is doubtful. 
k.—Upon momentarily closing and opening the eyes, there 
was an appearance of a rosette-shaped space, its centre always in 
the axis of vision, which distinetly and always showed the com- 
plementary color of the glass before the eye at the time. This 
appeared with all glasses; it showed where the axis of vision 
pierced the sky at the time; and that the cascade was in this 
axis, the point of jetting in of corpuscles (g) in or very near it. 
This rosette seemed to me to mark the limits of distinct vision 
—Looking at midday against light cloud: The e, 
small, but very perfect, flowing up, or down. 
the cobalt-glass; more faint, through orange, red, and violet. 
o see any moving traces of the corp ellow or red 
cians, it was found n to compress the eye-ball, as could 
done by making the effort to retract it, and to look intoa 
Space very near the eyes. ‘ 
Tn regard to the facts mentioned in (&), it should be added, 
the traces of the dises were visible both in and around the cen- 
Am. Jour. Sc1.—Szconp Series, Vou. XXXI, No. 93.—May, 1861. 
44 
