d central mountain, a
crater, and at least three other depressions on the S.W. wall where it
joins Mason.

BURG.--A noteworthy formation, 28 miles in diameter, on the Mare, N. of
Plana. The floor is concave, and includes a very large bright mountain,
which occupies a great portion of it. The interior slopes are prominently
terraced, and there are several spurs associated with the _glacis_ on the
S. and N.E. A distinct cleft runs from the N. side of the formation to
the S.E. border of the Lacus Somniorum, which is crossed by another
winding cleft running from a crater E. of Plana towards the N.E.

BAILY.--A small ring-plain, N. of Burg, flanked by mountains, with a
large bright crater on the W. The group of mountains standing about
midway between it and Burg are very noteworthy.

GARTNER.--A very large walled-plain with a low incomplete border on the
E., but defined on the W. by a lofty wall. Schmidt shows a curved crater-
row on the W. side of the floor.

DEMOCRITUS.--A deep regular ring-plain, about 25 miles in diameter, with
a bright central mountain and lofty terraced walls.

ARNOLD.--A great enclosure, bounded, like so many other formations
hereabouts, by straight parallel walls. There is a somewhat smaller
walled-plain adjoining it on the W.

MOIGNO.--A ring-plain with a dark floor, adjoining the last on the N.E.
There is a conspicuous little crater in the interior.

EUCTEMON.--This object is so close to the limb that very little can be
made of its details under the most favourable conditions. According to
Neison, there is a peak on the N. wall 11,000 feet in height.

METON.--A peculiarly-shaped walled-plain of great size, exhibiting
considerable parallelism. The floor is seen to be very rugged under
oblique illumination.

WEST LONGITUDE 20 deg. TO 0 deg.

SABINE.--The more westerly of a remarkable pair of ring-plains, of which
Ritter is the other member, situated on the E. side of the Mare
Tranquilitatis a little N. of the lunar equator. It is about 18 miles in
diameter, and has a low continuous border, which includes a central
mountain on a bright floor. From a mountain arm extending from the S.
wall, run in a westerly direction two nearly parallel clefts skirting the
edge of the Mare. The more southerly of these terminates near a
depression on a rocky headland projecting from the coast-line, and the
other stops a few miles short of this. A third cleft, commencing at a
point N.E. of the headland,