The Altai Mountains. A fine conspicuous serpentine range, extending from
the E. side of Piccolomini in a north-easterly direction to the region
between Tacitus and Catherina, a length of about 275 miles. The loftiest
peak is over 13,000 feet. The average height of the southern portion is
about 6000 feet. The region lying on the S.E. of this range is a vast
tableland, devoid of prominent objects, rising gradually towards the
mountains, which shelve rapidly down to an equally barren expanse on the
N.W.
The Pyrenees. These mountains, on the E. of Guttemberg, border the
western side of the Mare Nectaris. Their loftiest peak, rising nearly to
12,000 feet, is on the S.E. of Guttemberg.
LIST OF THE PRINCIPAL RAY-SYSTEMS, LIGHT-SURROUNDED CRATERS, AND LIGHT-
SPOTS.
[In this list, which does claim to be exhaustive, most of the objects
noted by Schmidt are incorporated.]