loftiest
about 800 feet above the Mare, some distance E. of this formation.

Euler beta. A fine but small mountain group, more than 3600 feet high, on
the Mare Imbrium, S.E. of Euler.

The Laplace Promontory. A magnificent headland on the N. side of the
Sinus Iridum, rising about 9000 feet above the latter, and about 7000
feet above the Mare Imbrium.

Cape Heraclides. A fine but less prominent headland on the opposite side
of the bay, rising more than 4000 feet above it.

Lahire. A large bright isolated mountain in the Mare Imbrium, N.E. of
Lambert, in N. lat. 27 deg., E. long. 25 deg. It is, according to
Schroter, nearly 5000 feet high.

Delisle beta. A curious club-shaped mountain on the S.E. of this
formation, nearly 4000 feet in height.

Pytheas beta. An isolated mountain, 900 feet high, in N. lat. 20 deg., E.
long. 23 deg.

Kirch. There is a small isolated hill a few miles N. of this formation.

Kirch GAMMA. A bright mountain about 700 feet high, in N. lat. 39 deg.,
E. long. 3 deg.

Piazzi Smyth beta. A small bright isolated mountain on a ridge S. of
this, is a noteworthy object under a low sun.

Lambert GAMMA. In N. lat. 26 deg., E. long. 18 deg.; a remarkable curved
mountain about 3000 feet in height, a brilliant object under a low sun.

D'Alembert Mountains. A range on the E. limb running S. from N. lat. 12
deg.

Wollaston. An isolated triangular mountain about midway between this and
Wollaston B.

THIRD QUADRANT.

The Riphaean Mountains. An isolated range S. of Landsberg in S. lat. 7
deg., E. long. 28 deg. They run in a meridional direction, and rise at
one peak to nearly 3000 feet above the Oceanus Procellarum.

The Percy Mountains extend from the eastern flank of Gassendi
towards Mersenius, forming the north-eastern border of the Mare
Humorum.

Prom. Aenarium. A steep bluff situated at the northern end of
a plateau, some distance E. of Arzachel, in S. lat. 18 deg., E. long. 9
deg. It rises some 2000 feet above the Mare Nubium.

Euclides zeta and chi. Two mountain masses N. of this formation in S.
lat. 5 deg.; zeta rises about 1700 feet above the Mare; both are
evidently offshoots from the Riphaean range.

Landsberg H. An isolated hill in S. lat. 4 deg., E. long. 25 deg.

Nicollet C. S.E. of Nicollet, in S. lat. 22 deg., E. long. 17 deg.; is
hemmed in by a mountain mass rising to more than 2000 feet above the Mare
Nubium.

The Stag's-Horn Mountains. At the S. end of the straight w