or three times since with an 8 1/2 inch Calver reflector. A small
crater, detected by Schmidt, which I once saw very distinctly under
evening illumination, stands on the floor at the foot of the W. wall.
Peirce A, a deeper formation, lies a little N. of Peirce, and has also,
according to Neison, a very slight central hill, which is only just
perceptible under the most favourable conditions. Schmidt appears to have
overlooked it.

PROCLUS.--One of the most brilliant objects on the moon's visible
surface, and hence extremely difficult to observe satisfactorily. It is
about 18 miles in diameter, with very steep walls, and, according to
Schmidt, has a small crater on its east border, where Madler shows a
break. It is questionable whether there is a central mountain. It is the
centre of a number of radiating light streaks which partly traverse the
Mare Crisium, and with those emanating from Picard, Peirce, and other
objects thereon, form a very complicated system.

MACROBIUS.--This, with a companion ring on the W., is a very beautiful
object under a low sun. It is 42 miles in diameter, and is encircled by a
bright, regular, but complex border, some 13,000 feet in height above the
floor. Its crest is broken on the E. by a large brilliant crater, and its
continuity is interrupted on the N. by a formation resembling a large
double crater, which is associated with a number of low rounded banks and
ridges extending some distance towards the N.W., and breaking the
continuity of the _glacis_. The W. wall is much terraced, and on the N.W.
includes a row of prominent depressions, well seen when the interior is
about half illuminated under a rising sun. The central mountain is of the
compound type, but not at all prominent. The companion ring, Macrobius C,
is terraced internally on the W., and the continuity of its N. border
broken by two depressions. There is a rill-valley between its N.E. side
and Macrobius.

CLEOMEDES.--A large oblong enclosure, 78 miles in diameter, with massive
walls, varying in altitude from 8000 to 10,000 feet above the interior.
The most noteworthy features in connection with the circumvallation are
the prominent depressions on the W. wall. Under a rising sun, when about
one-fourth of the floor is in shadow, three of these can be easily
distinguished, each resembling in form the analemma figure. There are two
other curious depressions at the S.W. end of the formation. On the dark
steel-grey floor are two ir