connection with the S.E.
wall. Excepting one crater, nearly central, and some inconspicuous
ridges, I have seen no detail on the floor. Schmidt, however, records
many features.

WALTER.--A great rhomboidal walled-plain, 100 miles in diameter, with a
considerably depressed floor, enclosed by a rampart of a very complex
kind, crowned by numerous peaks, one of which, on the W., rises 10,000
feet above the interior. If the formation is observed when it is close to
the morning terminator, say, when the latter lies from l deg. to 2 deg.
E. of the centre of the floor, it is one of the most striking and
beautiful objects which the lunar observer can scrutinize. The inner
slope of the border which abuts on Regiomontanus, examined at this phase
under a high power, is seen to be pitted with an inconceivable number of
minute craters; and the summit ridge, and the region towards Werner,
scalloped in a very extraordinary way, the engrailing (to use an heraldic
term) being due to the presence of a row of big depressions. The floor at
this phase is sufficiently illuminated to disclose some of its most
noteworthy features. Taking its area to be about 8000 square miles, at
least 1200 square miles of it is occupied by the central mountain group
and its adjuncts, the highest peak rising to a height of nearly 5000 feet
(or nearly 600 feet higher than Ben Nevis), above the interior, and
throwing a fine spire of shadow thereon. In the midst of this central
boss are two deep craters, one being about 10 miles in diameter, and a
number of shallower depressions. In association with the loftiest peak, I
noted at 8 h., March 9, 1889, two brilliant little craters, which
presumably are not far from the summit. Near the E. corner of the floor
there is another large deep crater, and, ranging in a line from the
centre to the S.E. wall, three smaller craters.

LEXELL.--On the E. of Walter extends an immense plain of irregular
outline, which is at least equal to it in area. Though no large formation
is found thereon; many ridges, short crater-rows, and ordinary craters
figure on its rugged superficies; and on its borders stand some very
noteworthy objects, among them, on the S., the walled-plain Lexell, about
32 miles in diameter, which presents many points of interest. Its
irregular wall, rising, at one point on the S.W., to a height of nearly
8000 feet, is on the N.W. almost completely wanting, only very faint
indications of its site being traceable,