formations, associated with the
highlands bordering the S.W. and the W. flanks of the Mare Crisium. It
has a central mountain and other minor elevations on the floor. There is
a little ring between Alhazen and Hansen, never very conspicuous in the
telescope, which is plainly traceable in good photographs.

EIMMART.--A conspicuous ring-plain with bright walls on the N.W. margin
of the Mare Crisium. The E. border attains a height of 10,000 feet above
the interior, which, according to Schmidt, has a small central mountain.
There is a rill-like valley on the E. of the formation.

ORIANI.--An irregular object, 32 miles in diameter, somewhat difficult to
identify, N.W. of the last. There is a conspicuous crater on the N. of
it, with which it is connected by a prominent ridge.

PLUTARCH.--A fine ring-plain W. of Oriani, with regular walls, and,
according to Neison, with two central mountains, only one of which I have
seen. Both this formation and the last are beautifully shown in a
photograph taken August 19, 1891, at the Lick Observatory, when the
moon's age was 15 d. 10 hrs.

SENECA.--Rather smaller than Plutarch. Too near the limb for satisfactory
observation. Schmidt shows two considerable mountains in the interior.
The position of this object in Schmidt's chart is not accordant with its
place in Beer and Madler's map, nor in that of Neison.

HAHN.--A ring-plain, 46 miles in diameter, with a fine central mountain
and lofty peaks on the border, which is not continuous on the S. There is
a large and prominent crater on the E.

BEROSUS.--A somewhat smaller object of a similar type, N. of Hahn, but
with a loftier wall. There is a want of continuity also in the border,
the eastern and western sections of which, instead of joining, extend for
some distance towards the S., forming a narrow gorge or valley. Outside
the S.E. wall there is a small crater, and some irregular depressions on
the E. The minute central mountain is only seen with difficulty under a
low evening sun. The bright region between Hahn and Berosus and the
western flank of Cleomedes is an extensive plain, devoid of prominent
detail, and which, according to Neison, includes an area of 40,000 square
miles.

GAUSS.--A large, and nearly circular walled-plain, 111 miles in diameter,
situated close to the N.W. limb, and consequently always foreshortened
into a more or less elongated ellipse. But for this it would be one of
the grandest objects in the first quad