a small scale the well-known "railroad" E. of
Thebit. Diophantus has no central mountain.

DELISLE.--A larger and more irregularly-shaped object than the last, 16
miles in diameter, with loftier and more massive walls, and an extensive
but ill-defined central hill. There is an evident break in the northern
border. A triangular mountain on the S.E. and a winding ridge running up
to the N. wall are prominent features at sunrise, as are also the
brilliant summits of a group of hills some distance to the E.N.E.

CARLINI.--A small but prominent and deep little crater about 5 miles in
diameter on the Mare Imbrium about midway between Lambert and the Sinus
Iridum. There are many faint light streaks in the vicinity, one of which
extends from Carlini to Bianchini, on the edge of the Sinus,--a distance
of 300 miles. Schmidt shows a central peak.

CAROLINE HERSCHEL.--A bright and very deep ring-plain about 8 miles in
diameter on the Mare Imbrium, some distance E.N.E. of the last. On the
S.E. lies a larger crater, Delisle B, which has a small but obvious
crater on its N. rim, and casts a very prominent shadow at sunrise.
Caroline Herschel stands on a long curved ridge running N.E. from Lambert
towards the region E. of Helicon, and, according to Schmidt, has a
central peak. On the E. is a bright mountain with two peaks; some
distance N. of which is a large ill-defined white spot, with another spot
of a similar kind on the W. of it, nearly due N. of Caroline Herschel.

GRUITHUISEN.--This ring-plain, 10 miles in diameter, is situated on the
Mare Imbrium on the N.E. of Delisle. It is associated with a number of
ridges trending towards the region N. of Aristarchus and Herodotus.

THE LAPLACE PROMONTORY.--A magnificent headland marking the extreme
western extremity of the finest bay on the moon's visible surface, the
Sinus Iridum; above which it towers to a height of 9000 feet or more,
projecting considerably in front of the line of massive cliffs which
define the border of the Sinus, and presenting a long straight face to
the S.E. Near its summit are two large but shallow depressions, the more
easterly having a very bright interior. At a lower level, almost directly
below the last, is a third depression. All three are easy objects under a
low sun. The best view of the promontory and its surroundings is obtained
when the E. side of the bay is on the morning terminator. Its prominent
shadow is traceable for many days after sunrise.