little N. of a depression on the border
to a larger crateriform depression on the S. of Hipparchus K. Birt terms
it "a very fugitive and delicate lunar feature." As regards the vast
superficies enclosed by this irregular border, it is chiefly remarkable
for the number of large saucer-shaped hollows which are revealed on its
surface under a low sun. They are mostly found on the eastern quarter of
the floor. Some of them appear to have very slight rims, and in two or
three instances small craters may be detected within them. Owing to their
shallowness, they are very evanescent, and can only be glimpsed for an
hour or so about sunrise or sunset. The large bright crater A, about 4
miles in diameter on the N.W. side of the interior, is by far the most
conspicuous object upon it. Adjoining it on the N. is a large ring with a
low border, and N. of this again is another, extending to the wall. Mr.
Maw and Mr. Mee have seen minute craters on the borders of these obscure
formations. In addition to the objects just specified, there is a fairly
conspicuous crater, _d_, on the N.E. quarter of the floor, and a very
large number of others distributed on its surface, which is also
traversed by a network of light streaks, that have recently been
carefully recorded by Mr. A.S. Williams. A cleft, from near Reaumur A,
traverses the N. side of the floor, and runs up to Ptolemaeus _d_.

ALPHONSUS.--A large walled-plain, 83 miles in diameter, with a massive
irregular border abutting on the S.S.E. side of Ptolemaeus, and rising at
one place on the N.W. to a height of 7000 feet above the interior. The
floor presents many features of interest. It includes a bright central
peak, forming part of a longitudinal ridge, on either side of which runs
a winding cleft, originating at a crater-row on the N. side of the
interior. There is a third cleft on the N.W. side, and a fourth near the
foot of the E. wall. There are also three peculiar dark areas within the
circumvallation; two, some distance apart, abutting on the W. wall, and a
third, triangular in shape, at the foot of the E. wall. The last-
mentioned cleft traverses this patch. These dusky spots are easily
recognised in good photographs of the moon.

ALPETRAGIUS.--A fine object, 27 miles in diameter, closely connected with
the S.E. side of Alphonsus. It has peaks on the W. towering 12,000 feet
above the floor, on which there is an immense central mountain, which in
extent, complexity, and altitu