it stands a curious spiral mountain called the Schneckenberg.  The question as to whether Hyginus N. (as the dusky spot is called) is a new object or not, cannot be definitely determined, as, in spite of a strong case in favour of it being so, there remains a residuum of doubt and uncertainty that can never be entirely cleared away.  After weighing, however, all that can be said “for and against,” the hypothesis of change seems to be the most probable.

UKERT.—­This bright crater, 14 miles in diameter, situated in the region N.E. of Triesnecker, is surrounded by a very complicated arrangement of mountains; and on the N. and W. is flanked by other enclosures.  It has a distinct central mountain.  Its most noteworthy feature is the great valley, more than 80 miles long, which extends from N.E. to S.W. on the E. side of it.  This gorge is at least six miles in breadth, of great depth, and is only comparable in magnitude with the well-known valley which cuts through the Alps, W. of Plato.  A delicate cleft, not very clearly traceable as a whole, begins near its N. end, and terminates amid the ramifications of the Apennines S. of Marco Polo.

TAQUET.—­A conspicuous little crater on the S. border of the Mare Serenitatis at the foot of the Haemus Mountains.  A branch of the great Serpentine ridge, which traverses the W. side of this plain and other lesser elevations, runs towards it.

MENELAUS.—­A conspicuously bright regular ring-plain, about 20 miles in diameter, situated on the S. coast-line of the Mare Serenitatis, and closely associated with the Haemus range.  It has a brilliant central mountain, but no visible detail on the walls.  On the edge of the Mare, S.W. of it, there is a curious square formation.  The bright streak traversing the Mare from N. to S., which is so prominently displayed in old maps of the moon, passes through this formation.

SULPICIUS GALLUS.—­Another brilliant object on the south edge of the Mare Serenitatis, some distance E. of the last.  It is a deep circular crater about 8 miles in diameter, rising to a considerable height above the surface.  Its shadow under a low morning sun is prominently jagged.  On the E. are two bright mounds, and S. of that which is nearer the border of the Mare, commences a cleft which, following the curvature of the coast-line, terminates at a point in W. long. 9 deg.  This object varies considerably in width and depth.  Another shorter and coarser cleft runs S. of this across an irregularly shaped bay or inflexion in the border of the Mare.

MANILIUS.—­This, one of the most brilliant objects in the first quadrant, is about 25 miles in diameter, with walls nearly 8000 feet above the floor, which includes a bright central mountain.  The inner slope of the border on the E. is much terraced and contains some depressions.  There is a small isolated bright mountain 2000 feet high on the Mare Vaporum, some distance to the E.