another nearly concentric
ring-plain, of considerably less altitude within it, and a large bright
central boss, overlooking the inner wall, 1700 feet in height. The outer
wall is somewhat irregular, and is broken by gaps and valleys on the S.
and N.W. It rises on the E. about 5000 feet above the Mare, but only
about 2000 above the interior, which includes a crater on its N. side,
and some low ridges.

HAINZEL.--This remarkable formation, which is about 55 miles in greatest
length, but is hardly half so broad, derives its abnormal shape from the
partial coalescence of two nearly equal ring-plains, the walls of both
being very lofty,--more than 10,000 feet. It ought to be observed under a
morning sun when the floor is about half illuminated. At this phase the
extension of the broad bright terraced E. border across a portion of the
interior is very apparent, and the true structural character of the
formation clearly revealed. The floor abounds in detail, among which, on
the S., are some large craters and a bright longitudinal ridge. Hainzel
is flanked on the W. and S.W. by a broad plateau, W. of which stand two
ring-plains about 15 miles in diameter, both having prominent central
mountains and bright interiors.

WILHELM I.--A large irregular formation, about 50 miles across, S.E. of
Heinsius, with walls varying very considerably in height, rising more
than 11,000 feet on the E., but only about 7000 feet on the opposite
side. The border is everywhere crowded with depressions, large and small.
Three ring-plains, not less than 6 miles in diameter, stand upon the S.
wall, the most westerly overlapping its shallower neighbour on the E.,
which projects beyond the wall on to the floor. The interior has a very
rugged and uneven surface, upon the N. side of which are two very
distinct craters, and a short crater-row on the W. of them. It is
traversed from W. to E. by three bright streaks from Tycho, two on the N.
being very prominent under a high light.

LONGOMONTANUS.--A much larger walled-plain, S. of the last. It is 90
miles in diameter, with a border much broken by depressions, especially
on the N.E. At one peak on this side it rises to the tremendous altitude
of 13,000 feet above the floor, and at peaks on the W. more than 1000
feet higher. There is a crowd of ring-plains on the N.E. quarter of the
interior, and some hills and craterlets in other parts of it. It is also
crossed by rays from Tycho.

SCHILLER.--A fine lozen