and is a larger and more complex
object, of irregular form, with very lofty peaks on its border. A
prominent ridge of great height traverses the formation from N. to S.,
abutting on the W. border of Lacaille. Delaunay is the last link in the
chain commencing with Argelander.

LACAILLE.--An oblong enclosure situated on the N. side of Blanchinus, and
apparently about 30 miles in greatest diameter. The border is to a great
extent linear and continuous on the N., but elsewhere abounds in
depressions. Two large inosculating ring-plains are associated with the
N.E. wall.

BLANCHINUS.--A large walled-plain on the W. of Purbach and abutting on
the S. side of Lacaille. It much resembles Purbach in shape, but has
lower walls. Schmidt shows a crater on the N. side of the floor, which I
have seen, and a number of parallel ridges which have not been noted,
probably because they are only visible under very oblique light.

GEBER.--A bright ring-plain, 25 miles in diameter, S. of Almanon, with a
regular border, rising to a height on the W. of nearly 9000 feet above
the floor. There is a small crater on the crest of the S. wall, and
another on the N. A ring-plain about 8 miles in diameter adjoins the
formation on the N.E. According to Neison, there is a feeble central
hill, which, however, is not shown by Schmidt.

SACROBOSCO.--This is one of those extremely abnormal formations which are
almost peculiar to certain regions in the fourth quadrant. It is about 50
miles in greatest diameter, and is enclosed by a rampart of unequal
height, rising on the E. to 12,000 feet above the floor, but sinking in
places to a very moderate altitude. On the N. its contour is, if
possible, rendered still more irregular by the intrusion of a smaller
ring-plain. On the N.E. side of the floor stands a very bright little
crater and two others on the S. of the centre, each with central
mountains.

FERMAT.--An irregular ring-plain 25 miles in diameter on the W. of
Sacrobosco. Its partially terraced wall is broken on the N. by a gap
which communicates with the interior of a smaller formation. There are
some low hills on the floor, which is depressed 6000 feet below the crest
of the border.

AZOPHI.--A prominent ring-plain, 30 miles in diameter, E.N.E. of
Sacrobosco, its lofty barrier towering nearly 11,000 feet above a
somewhat dusky interior, which includes some light spots. A massive
curved mountain arm runs from the S. side of this formation to a smal