Cavalerius. Though a very distinct formation, it is difficult to see its
details except under favourable conditions of libration. It has a large
crater on its W. wall, a smaller one on the E., and a third on the N. The
floor includes a central mountain, and, according to Schmidt, four
craters. He also shows a crater-rill on the W. wall, N. of the large
crater thereon. Olbers is the origin of a fine system of light rays.

GALILEO.--A ring-plain, about 9 miles in diameter, N.E. of Reiner,
associated with ridges, some of which extend to the "Jew's Harp" marking
referred to under this formation.

CARDANUS.--A fine regular ring-plain, about 32 miles in diameter, near
the limb N. of Olbers. Its bright walls, rising about 4000 feet above the
light grey floor, are clearly terraced, and exhibit, especially on the
S.E., several spurs and buttresses. There is a fine valley on the outer
W. slope, a large bright crater on the Mare just beyond its foot, and a
conspicuous mountain in the same position farther north. I have not
succeeded in seeing the faint central hill nor the crater N. of it shown
by Schmidt, but there is a brilliant white circular spot on the floor at
the inner foot of the N.E. wall which he does not show.

KRAFFT.--A very similar object on the N., of about the same dimensions;
with a central peak, and a large crater on the dark floor abutting on the
S.W. wall, and another of about half the size on the outer side of the W.
border. From this crater a very remarkable cleft runs to the N. wall of
Cardanus: it is bordered on either side by a bright bank, and cuts
through the N.W. border of the latter formation. It is best seen when the
E. wall of Cardanus is on the morning terminator.

VASCO DE GAMA.--A bright enclosure, 51 miles in diameter, with a small
central mountain. It is associated on the N. with a number of enclosed
areas of a similar class, all too near the limb to be well seen.

SELEUCUS.--A considerable ring-plain, 32 miles in diameter, with lofty
terraced walls, rising 10,000 feet above a dark floor which includes an
inconspicuous central hill. This formation stands on a ridge extending
from near Briggs to the W. side of Cardanus.

OTTO STRUVE.--An enormous enclosure, bounded on the E. by the Hercynian
Mountains, and on the W. by a mountain chain of considerable altitude,
surmounted by three or more bright little rings. On the W. side of the
uneven-toned interior, which, according to Madler, includes a