there is a large bright crater, but apparently
no other conspicuous details. On the S.E. side of Zagut lies an
elliptical ring-plain, about 28 miles in diameter, named by Schmidt
CELSIUS. The border of this is open on the N., the gap being occupied by
a large crater, whose S. wall is wanting, so that the interiors of both
formations are in communication.

LINDENAU.--This formation, about 35 miles in diameter, is bounded on the
W. by a regular unbroken wall nearly 8600 feet in height; but which on
the E. and N.E. is far loftier and more complex, rising to about 12,000
feet above the floor, consisting of four or more distinct ramparts,
separated by deep valleys, and extending towards Rabbi Levi. Neison
points out that under a high light Lindenau appears to have a bright
uniform single wall. There is a small central mountain and some minor
inequalities in the interior.

RABBI LEVI.--A larger but less obvious formation than either of its
neighbours, Zagut and Lindenau, abutting on the S. side of them. It is
about 55 miles in diameter, and is enclosed by a border somewhat
difficult to trace in its entirety, except under oblique light. There are
some large craters within it, of which one on the N. side of the floor is
especially prominent.

NICOLAI.--A tolerably regular ring-plain, 18 miles in diameter, S. of
Riccius, with a border, rising more than 6000 feet above a level floor,
on the N. side of which Schmidt shows a minute crater. The bright plain
surrounding this formation abounds in small craters; and on the W. is a
number of curious enclosures, many of them overlapping.

VLACQ.--A member of a magnificent group of closely associated formations
situated on the greatly disturbed area between W. long. 30 deg. and 45
deg. and S. lat. 50 deg. and 60 deg. It is 57 miles in diameter, and is
enclosed by terraced walls, rising on the W. about 8000 feet, and on the
E. more than 10,000 feet above the floor. They are broken on the S. by a
fine crater. In addition to a conspicuous central peak, there are several
small craters, and low short ridges in the interior.

HOMMEL.--Adjoins Vlacq on the S. It is a somewhat larger and a far more
irregular formation. On every side except the W., where the border is
unbroken, and descends with a gentle slope to the dark interior; ring-
plains and smaller depressions encroach on its outline, perhaps the most
remarkable being Hommel _a_ on the N., which has an especially brilliant
wall, that