all, or
"railroad," in S. lat. 24 deg., E. long. 8 deg., a curious mountain mass
rising about 2000 feet above the Mare Nubium.

Lacroix delta. A mountain more than 7000 feet high, N. of Lacroix.

Flamsteed E. A mountain of more than 3000 feet in S. lat. 4 deg., E.
long. 51 deg.

D'Alembert Mountains. A very lofty range on the E. limb, extending to S.
lat. 11 deg.

The Cordilleras. Close to the E. limb; they lie between S. lat. 8 deg.
and S. lat. 23 deg.

Rook Mountains. On the E. limb, extending from about S. lat. 18 deg. to
S. lat. 35 deg. According to Schroter, they attain a height of 25,000
feet.

Dorfel Mountains. On the S.E. limb between S. lat. 57 deg. and S. lat. 80
deg.

Leibnitz Mountains. On the S. limb extending W. from S. lat. 80 deg.
beyond the Pole on to the Fourth Quadrant. Perhaps the loftiest range on
the limb. Madler's measures give more than 27,000 feet as the height of
one peak, and there are several others nearly as high.

FOURTH QUADRANT.

The Altai Mountains. A fine conspicuous serpentine range, extending from
the E. side of Piccolomini in a north-easterly direction to the region
between Tacitus and Catherina, a length of about 275 miles. The loftiest
peak is over 13,000 feet. The average height of the southern portion is
about 6000 feet. The region lying on the S.E. of this range is a vast
tableland, devoid of prominent objects, rising gradually towards the
mountains, which shelve rapidly down to an equally barren expanse on the
N.W.

The Pyrenees. These mountains, on the E. of Guttemberg, border the
western side of the Mare Nectaris. Their loftiest peak, rising nearly to
12,000 feet, is on the S.E. of Guttemberg.

LIST OF THE PRINCIPAL RAY-SYSTEMS, LIGHT-SURROUNDED CRATERS, AND LIGHT-
SPOTS.

[In this list, which does claim to be exhaustive, most of the objects
noted by Schmidt are incorporated.]

FIRST QUADRANT.

Autolycus. Encircled by a delicate nimbus, throwing out four or five
prominent rays extending towards Archimedes. Seen best under evening
illumination.

Aristillus. The centre of a noteworthy system of delicate rays extending
W. towards the Caucasus; and on the S. disappearing among the rays of
Autolycus. They are traceable on the Mare Nubium near Kirch.

Theaetetus. A very brilliant group of little hills E. of this formation.

Eudoxus A. A light-surrounded crater W. of Eudoxus, with distinct long
streaks, one of which extends to the S. wall of Aristoteles.