S.E. of Segner, which it slightly overlaps.
It is very similar in size and general character, and has a lofty
terraced wall, rising at one place on the W. to nearly 11,000 feet above
the floor. A very fine chain of craters, well seen when the opposite
border is on the morning terminator, runs round the outer W. slope of the
wall. There is a bright crater beyond this on the S.W. Zuchius has a
central peak.

BETTINUS.--Another ring-plain of the same type and size, some distance S.
of the last, with a massive border, terraced within, and rising on the W.
more than 13,000 feet above the floor, on which stands a grand central
mountain, whose brilliant summit is in sunlight a long time before a ray
reaches any part of the deep interior.

KIRCHER.--A ring-plain, about 45 miles in diameter, S. of Bettinus,
remarkable also for its very lofty rampart, which on the S. attains the
tremendous height of nearly 18,000 feet above the floor, which appears to
be devoid of detail.

WILSON.--The most southerly of the chain of five massive ring-plains,
extending in an almost unbroken line from Segner and differing only very
slightly in size. It is about 40 miles in diameter, and has a somewhat
irregular border, both as regards shape and height, rising at one peak on
the S.W. to nearly 14,000 feet above a level interior, which apparently
contains no conspicuous features.

EAST LONGITUDE 60 deg. TO 90 deg.

GRIMALDI.--This ranks among the largest wall-surrounded plains on the
moon, and is perhaps the darkest. It extends 148 miles from N. to S. and
129 miles from E. to W., enclosing an area of some 14,000 square miles,
or nearly double that of the principality of Wales. This vast dusky
surface is bounded on the E. by a tolerably regular border, having an
average height of about 4000 feet, while on the opposite side it is much
broken, and in places considerably loftier, rising at one peak on the
S.W. to an altitude of 9000 feet. About midway, also, this western
rampart attains a great height, as may be seen by any one who observes at
sunrise the magnificent shadow of it, and its many peaks thrown across
the bluish-grey interior. On the S. the wall is broken by a large
irregular depression, on the W. of which is a very curious V-shaped rill
valley. On the N.W. it is comparatively low, and in places discontinuous;
and even to a greater extent than on the S.W., intersected by passes. At
the extreme N. end, a number of wide valleys cut t