ly more than 4 miles wide.

RHEITA.--A formation, about 35 miles in diameter, S. of Reichenbach, with
regular lofty walls, rising at a peak on the N.E. to a height of more
than 14,000 feet above the interior, on which there is a small but
prominent central mountain, a smaller elevation W. of the centre, and two
adjoining craters at the foot of the S. wall. On the E. originates
another fine valley, very similar to that already mentioned in connection
with Reichenbach. It runs in a S.S.W. direction, is about 100 miles in
length, and, in its widest part, is about 12 miles across. Like the
Reichenbach valley, it terminates at a small crater-like object, which
has a border broken down on the side facing the valley, and a small
central hill. About midway between its extremities, this great gorge is
crossed by a wall of rock, like a narrow bridge.

JANSSEN.--An immense irregular enclosure, reminding one of the very
similar area, bordered by Walter, Lexell, Hell, &c., in the third
quadrant. It extends about 150 miles from E. to W., and more than 100
from N. to S., its limits on the N. being rather indefinite. Its very
rugged humpy surface includes one great central mountain, and innumerable
minor hills and ridges, craters, and crater-pits; but the principal
feature is the magnificent curved rill-valley running from the S. side of
Fabricius across the rough expanse to the S. side. This fine object, very
coarse on the N., passes the central mountain on the E. side, and becomes
gradually narrower as it approaches the border; before reaching which,
another finer cleft branches from it on the W., and also runs to the S.
side of the plain.

LOCKYER.--A prominent deep ring-plain, 32 miles in diameter, with massive
bright lofty walls, standing just outside the S.E. border of Janssen.
Schmidt shows a minute crater on the S. rim. I have seen a crater within,
at the inner foot of the W. wall, and a central peak.

FABRICIUS.--A ring-plain, 55 miles in diameter, with a lofty terraced
border, rising on the S.W. to a height of nearly 10,000 feet above the
interior. It is partially included by the rampart of Janssen, and the
great rill-valley on the floor of the latter appears to cut through its
S. wall. There is a long central mountain on the floor, with a prominent
ridge extending along the E. side of it. W. of Fabricius (between it and
the border of Janssen) lies a very irregular enclosure, with three
distinct craters within it; and on t