Y.--A bright little crater, not more than 7 or 8 miles in diameter,
on the W. side of the Mare Tranquilitatis, N.E. of Taruntius. It has a
peak on its W. rim considerably loftier than the rest of the wall, which
is visible as a brilliant spot at sunrise long before the rest of the
rampart is illuminated. On the S. there are two bright longitudinal
ridges ranging from N.E. to S.W. These stand in the position where Neison
draws two straight clefts. The Cauchy cleft, however, lies N. of these,
and terminates, as shown by Schmidt, among the mountains N.E. of
Taruntius. I have seen it thus on many occasions, and it is so
represented in a drawing by M.E. Stuvaert (_Dessins de la Lune_). There
is a number of minute craters and mounds standing on the S. side of this
cleft, and many others in the vicinity.

JANSEN.--Owing to its comparatively low border, this is not a very
conspicuous object. It is chiefly remarkable for the curious arrangement
of the mountains and ridges on the S. and W. of it. There is a bright
little crater on the S. side of the floor, and many noteworthy objects of
the same class in the neighbourhood. The mountain arm running S., and
ultimately bending E., forms a large incomplete hook-shaped formation
terminating at a ring-plain, Jansen B. The ridges in the Mare
Tranquilitatis between Jansen B. and the region E. of Maskelyne display
under a low sun foldings and wrinklings of a very extraordinary kind.

MACLEAR.--A conspicuous ring-plain about 16 miles in diameter. The dark
floor includes, according to Madler, a delicate central hill which
Schmidt does not show. Neison, however, saw a faint greyish mark, and an
undoubted peak has been subsequently recorded. I have not succeeded in
seeing any detail within the border, which in shape resembles a triangle
with curved sides.

ROSS.--A somewhat larger ring-plain of irregular form, on the N.W. of the
last. There are gaps on the bright S.W. border and a crater on the S.E.
wall. The central mountain is an easy feature.

PLINIUS.--This magnificent object reminds one at sunrise of a great
fortress or redoubt erected to command the passage between the Mare
Tranquilitatis and the Mare Serenitatis. It is 32 miles in diameter, and
is encompassed by a very massive rampart, rising at one peak on the E. to
more than 6000 feet above the interior, and displaying, especially on the
S.E., and N., many spurs and buttresses. The exterior slopes at sunrise,
and even when the sun