by bright walls, is a noteworthy feature at sunrise. There are
other longitudinal valleys with associated ridges on this side of the
formation, all running in the same direction. There is a large bright
crater outside the border on the N.E., and, between it and the wall,
another, smaller, which is readily seen under a high sun.

AGRIPPA.--A ring-plain 28 miles in diameter on the N. of the last, with a
terraced border rising to a height of between 7000 and 8000 feet above
the floor, which contains a large bright central mountain and two craters
on the S. The shape of this formation deviates very considerably from
circularity, the N. wall, on which stands a small crater, being almost
lineal. On the W., at a distance of a few miles, runs the prominent
mountain range, extending northwards nearly up to the E. flank of Julius
Caesar, which bounds the E. side of the great Ariadaeus plain. Between
this rocky barrier and Agrippa is a very noteworthy enclosure containing
much minute detail and a long straight ridge resembling a cleft. A few
miles N. of Agrippa stands a small crater; at a point W. of which the
Hyginus cleft originates.

SILBERSCHLAG.--A very brilliant crater, 8 or 9 miles in diameter,
connected with the great mountain range just referred to. The Ariadaeus
cleft cuts through the range a few miles N. of it. This neighbourhood at
sunrise presents a grand spectacle. With high powers under good
atmospheric conditions, the plain E. of the mountains is seen to be
traversed by a number of shallow winding valleys, trending towards
Agrippa, and separated by low rounded hills which have all the appearance
of having been moulded by the action of water.

BOSCOVICH.--This is not a very striking telescopic object under any
phase, on account of its broken, irregular, and generally ill-defined
border. It is, however, remarkable as being one of the darkest spots on
the visible surface: in this respect a fit companion to Julius Caesar,
its neighbour on the W. Schmidt shows some ridges within it.

RHAETICUS.--A very interesting formation, about 25 miles in diameter,
situated near the lunar equator, with a border intersected by many
passes. A deep rill-like valley winds round its eastern _glacis_,
commencing on the S. at a small circular enclosure standing at the end of
a spur from the wall; and, after crossing a ridge W. of a bright little
crater on the N. of the formation, apparently joins the most easterly
cleft of the Triesnec