regular dusky areas, and a narrow but bright
central mountain, on which, according to Schmidt, stand two little
craters. There are two ring-plains on the S.W. quarter, and a group of
three associated craters on the N. side, one of which (A) Schroter
believed came into existence after he commenced to observe the formation,
a supposition that has been shown by Birt and others to be very
improbable.

TRALLES.--A large irregular crater, one of the deepest on the visible
surface of the moon, situated on the N.E. wall of Cleomedes. There is a
crater on its N. wall, and, according to Schmidt, some ridges and three
closely associated craters on the floor.

BURCKHARDT.--This object, situated on an apparent extension of the W.
wall of Cleomedes, is 35 miles in diameter, with a lofty border, rising
on the E. to an altitude of nearly 13,000 feet. It has a prominent
central mountain and some low ridges on the floor, which, together with
two minute craters on the S.W. wall, I have seen under a low angle of
morning illumination. It is flanked both on the E. and W. by deep
irregular depressions, which present the appearance of having once been
complete formations.

GEMINUS.--A fine regular ring-plain, 54 miles in diameter, nearly
circular, with bright walls, rising on the E. to a height of more than
12,000 feet, and on the opposite side to nearly 16,000 feet above the
floor. Their crest is everywhere very steep, and the inner slope is much
terraced. There is a small but conspicuous mountain in the interior; N.
of which I have seen a long ridge, where Schmidt shows some hillocks. Two
fine clefts are easily visible within the ring, one running for some
distance on the S.E. side of the floor, mounting the inner slope of the
S.W. border to the summit ridge (where it is apparently interrupted), and
then striking across the plain in a S.W. direction. Here it is
accompanied for a short distance by a somewhat coarser companion, running
parallel to it on the N. The other cleft occupies a very similar position
on the N.W. side of the floor at the inner foot of the wall. On several
occasions, when observing this formation and the vicinity, I have been
struck by its peculiar colour under a low evening sun. At this time the
whole region appears to be of a warm light brown or sepia tone.

BERNOUILLI.--A very deep ring-plain on the W. side of Geminus. Under
evening illumination its lofty W. wall, which rises to a height of nearly
13,000 feet abov