e hills, and a crater.

WERNER.--A ring-plain, 45 miles in diameter, with a massive rampart
crowned by peaks almost as lofty as any on that of Aliacensis, and with
terraces fully as conspicuous. It has a magnificent central mountain,
4500 feet high. At the foot of the N.E. wall Madler observed a small
area, which he describes as rivalling the central peak of Aristarchus in
brilliancy. Webb, however, was unable to confirm this estimate, though he
noted it as very bright, and saw a minute black pit and narrow ravine
within it. Neison subsequently found that the black pit is a crater-cone.
It would perhaps be rash, with our limited knowledge of minute lunar
detail, to assert that Madler over-estimated the brightness of this area,
which may have been due to a _recent_ deposit round the orifice of the
crater-cone.

POISSON.--An irregular formation on the W. of Aliacensis, extending about
50 miles from W. to E., but much less in a meridional direction. Its N.
limits are marked by a number of overlapping ring-plains and craters, and
it is much broken elsewhere by smaller depressions. The E. wall is about
7000 feet in height.

GEMMA FRISIUS.--A great composite walled-plain, 80 miles or more in
length from N. to S., with a wall rising at one place nearly 14,000 feet
above the floor. It is broken on the N. by two fine ring-plains, each
about 20 miles in diameter, and on the E. by a third open to the E. There
is a central mountain, and several small craters on the floor, especially
on the W. side.

BUSCHING.--A ring-plain S. of Zagut, about 36 miles in diameter, with a
moderately high but irregular wall. There are several craterlets within
and some low hills.

BUCH.--Adjoins Busching on the S.E. It is about 31 miles in diameter, and
has a less broken barrier. There is a large crater on the E. wall, and
another smaller one on the S.W. Schmidt shows nothing on the floor, but
Neison noted two minute crater-cones.

MAUROLYCUS.--This unquestionably ranks as one of the grandest walled-
plains on the moon's visible surface, and when viewed under a low sun
presents a spectacle which is not easily effaced from the mind. Like so
many of the great enclosures in the fourth quadrant, it impresses one
with the notion that we have here the result of the crowding together of
a number of large rings which, when they were in a semi-fluid or viscous
condition, mutually deformed each other. It extends fully 150 miles from
E. to W., and more fr