KIES.—­A somewhat similar formation, S. of Bullialdus, about 25 miles in diameter, also encircled by a border of insignificant dimensions, attaining an altitude of 2400 feet at only one point on the S.E., while elsewhere it is scarcely higher than that of Lubiniezky.  It is clearly polygonal, approximating to the hexagonal type.  On the more distinct S. section a bright spur projects from it.  On the N. its continuity is broken by a distinct little crater.  It is traversed by a remarkable white streak, extending in a S.W. direction from Bullialdus C (where it is very wide), across the interior, to the more westerly of two craters S.W. of Mercator.  Another streak branches out from it near the centre of the floor, and runs to the W. wall.  The principal streak, so far as the portion within Kies is concerned, represents a cleft.  On the Mare E. of Kies is a curious circular mound, and farther towards Campanus two prominent little mountains.  On the N.W. is a large obscure ring and a wide shallow valley bordered by ridges.

AGATHARCHIDES.—­A very irregular complex ring-plain, about 28 miles in diameter, forming part of the N.W. side of the Mare Humorum.  It must be observed under many phases before one can clearly comprehend its distinctive features.  The wall is very deficient on the N., but is represented in places by bright mountain masses.  The formation is flanked on the E. by a double rampart, which is at one place more than 5000 feet in height, with a deep intervening valley.  The S. wall is traversed by a number of parallel valleys, all trending towards Hippalus.  These are included in a much wider and longer chasm, which, gradually diminishing in breadth, extends up to the N. wall of the latter.

HIPPALUS.—­A partially ruined walled-plain, about 38 miles in diameter, on the W. side of the Mare Humorum, S. of Agatharchides.  At least one-third of the border is wanting on the S.E., but under a low sun its site can be distinguished by a faint marking and the obvious difference in tone between the dark interior and the lighter-coloured plain.  The rest of the wall is bright and continuous, except at a place on the W., where what appears to be the segment of a large ring has encroached upon it.  There are two craters in the interior of Hippalus, and a row of parallel ridges, running obliquely from the S.W. wall up to a cleft which traverses the floor from N. to S. W. of Hippalus stands a bright crater, Hippalus A, with an incomplete little ring-plain adjoining it on the N.W.; and N.E. of it a much larger obscure ring containing two little hills.  The Hippalus rill-system is a very interesting one, and the greater part of it can, moreover, be easily traced in a good 4 inch achromatic.  It originates in the rugged region E. of Campanus, from which five nearly parallel curved clefts extend up to the rocky barrier, connecting the N. side of this formation with the S.W. side of Hippalus.  The most westerly of these furrows is interrupted by a crater on this wall, but reappears