ty. It extends from west to east for a distance
of about 60 miles, being a few miles shorter than the last, and includes
a peak of 6000 feet.

_The Harbinger Mountains_.--A remarkable group, north-west of
Aristarchus, including some peaks as high as 7000 feet, and other details
noticed in the catalogue.

The above comprise all the mountain ranges in the northern hemisphere of
any prominence, or which have received distinctive names, except the
_Hercynian Mountains_, on the north-east limb, east of the walled plain
Otto Struve. These are too near the edge to be well observed, but, from
what can be seen of them, they appear to abound in lofty peaks, and to
bear more resemblance to a terrestrial chain than any which have yet been
referred to.

The mountain systems of the southern hemisphere, except the ranges
visible on the limb, are far less imposing and remarkable than those just
described. The _Pyrenees_, on the western side of the Mare Nectaris,
extend in a meridional direction for nearly 190 miles, and include a peak
east of Guttemberg of nearly 12,000 feet, and are traversed in many
places by fine valleys.

_The Altai Mountains_ form a magnificent chain, 275 miles in length,
commencing on the outer eastern slope of Piccolomini, and following a
tolerably direct north-east course, with a few minor bendings, to the
west side of Fermat, where they turn more towards the north, ultimately
terminating about midway between Tacitus and Catherina. The region
situated on the south-east is a great table-land, without any prominent
features, rising gently towards the mountains, which shelve steeply down
to an equally barren expanse on the north-west, to which they present a
lofty face, having an average altitude of about 6000 feet. The loftiest
peak, over 13,000 feet, rises west of Fermat.

_The Riphaean Mountains_, a remarkably bright group, occupying an
isolated position in the Mare Procellarum south of Landsberg, and
extending for more than 100 miles in a meridional direction. They are
most closely aggregated at a point nearly due west of Euclides, from
which they throw off long-branching arms to the north and south, those on
the north bifurcating and gradually sinking to the level of the plain.
The loftiest peaks are near the extremity of this section, one of them
rising to 3000 feet. Two bright craters are associated with these
mountains, one nearly central, and the other south of it.

_The Percy Mountains_.--This nam