cannot be less than 10,000 feet in height.

On the north side of the Mare Imbrium, east of Plato, there is a
beautiful narrow range of bright outlying heights, called the _Teneriffe
Mountains_, which include many isolated objects of considerable altitude,
one of the loftiest rising about 8000 feet. Farther towards the east lies
another group of a very similar character, called the _Straight Range_,
from its linear regularity. 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.