ULUGH BEIGH.—­A good-sized ring-plain, E. of the last, with a bright border and central mountain.  Too near the limb for observation.

LAVOISIER.—­A small bright walled-plain N. of Ulugh Beigh.  It has a somewhat dark interior.  West of it is Lavoisier A, a ring-plain about 14 miles in diameter.  Both are too near the limb for useful observation.

GERARD.—­A large enclosure close to the limb, still farther N., containing a long ridge and a crater.

HARDING.—­A small ring-plain W. of Gerard, remarkable for the peculiar form of its shadow at sunrise, and for the ridges in its vicinity.

REPSOLD.—­The largest of a group of walled enclosures, close to the limb, on the E. side of the Sinus Roris.

XENOPHANES.—­But for its position, this deep walled-plain, 185 miles in diameter, would be a fine telescopic object, with its lofty walls, large central mountain, and other details.

OENOPIDES.—­A large and tolerably regular walled-plain, 43 miles in diameter, on the W. of the last.  The depressions on the W. wall are worth examination at sunrise.  There is apparently no detail whatever on the floor.

CLEOSTRATUS.—­A small ring-plain, N. of Xenophanes, surrounded by a number of similar objects, all too near the limb for observation.

PYTHAGORAS.—­A noble walled-plain, 95 miles in diameter, which no one who observes it fails to lament is not nearer the centre of the disc, as it would then undoubtedly rank among the most imposing objects of its class.  Even under all the disadvantages of position, it is by far the most striking formation in the neighbourhood.  Its rampart rises, at one point on the N., to a height of nearly 17,000 feet above the floor, on which stands a magnificent central mountain, familiar to most observers.

THIRD QUADRANT

EAST LONGITUDE 0 deg.  TO 20 deg.

MOSTING.—­A very deep ring-plain, 15 miles in diameter, near the moon’s equator, and about 6 deg.  E. of the first meridian.  There is a crater on the N. side of its otherwise unbroken bright border, an inconspicuous central mountain, and, according to Neison, a dark spot on the S. side of the floor.  At some distance on the S.S.W., stands the bright crater, Mosting A, one of the most brilliant objects on the moon’s visible surface.

REAUMUR.—­A large pentagonal enclosure, about 30 miles in diameter, with a greatly broken border, exhibiting many wide gaps, situated on the E. side of the Sinus Medii, N.W. of Herschel.  The walls are loftiest on the S. and S.W., where several small craters are associated with them.  A ridge connects the formation with the great deep crater Reaumur A, and a second large enclosure lying on the W. side of the well-known valley W. of Herschel.  At the end of a spur on the S. side of the great crater originates a cleft, which I have often traced to the N.W. wall of Ptolemaeus, and across the N. side of the floor of this formation to a crater on the N.E. quarter of it, Ptolemaeus d.  There is a short cleft on the W. side of the floor of Reaumur, running from N. to S.