feet in height.

PIAZZI.--A walled-plain, about 90 miles in length, some distance S.E. of
Vieta, with a complex broken border, including several depressions on the
N.W., rising to about 7000 feet above a rather dark interior, on which
there is a prominent central mountain.

LAGRANGE.--A larger but similar formation, 100 miles in diameter,
associated with the last on the N.E., with a complex terraced border,
including peaks of 9000 feet, a bright crater on the W., and a ring-plain
on the N.W. The inner slope of the E. wall is a fine object at sunrise,
when libration is favourable. The floor is dark and devoid of detail.

BOUVARD.--A great irregular enclosure, which appears to be still larger
than Lagrange, S.E. of Piazzi, and close to the limb. It is bounded by a
very lofty rampart, rising at a peak on the W. to 10,000 feet. It has a
fine central mountain.

INGHIRAMI.--A very remarkable ring-plain, 60 miles in diameter, E. of
Schickard, with a bright, broad, and nearly continuous border, terraced
within, and intersected on the N.E. by narrow valleys, one of which is
prolonged over the floor and extends to the central mountain. There are
two curious dark spots on the N. side of the interior. Beyond the foot of
the _glacis_ on the S. a distinct cleft runs from a dusky spot to a group
of small craters E. of Wargentin. There is a fine regular ring-plain with
a small central mount W. of Inghirami.

PINGRE.--A ring-plain, about 18 miles in diameter, between Phocylides and
the limb.

HAUSEN.--A ring-plain, close to the limb, N. of Bailly, which, but for
its position, would be a fine object. It is, however, never sufficiently
well placed for observation.

BAILLY.--One of the largest wall-surrounded plains on the moon, almost a
"sea" in miniature, extending 150 miles from N. to S., and fully as much
from W. to E. When caught at a favourable phase, it is, despite its
position, especially worthy of scrutiny. The rampart on the W., of the
linear type, is broken by several bright craters. On the S.W. two
considerable overlapping ring-plains interfere with its continuity. On
the S.E. several very remarkable parallel curved valleys traverse the
border. The E. wall, which at one point attains a height of nearly 15,000
feet, is beautifully terraced. The floor on the eastern side includes
several ring-plains (some of which are of a very abnormal type), many
ridges, and two delicate dark lines, crossing each other near the S. end,