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other ranges of a similar character, but of less prominence andinterest, may also be easily found. In the beautiful photographby Mr. Rutherfurd, of New York , inserted at the beginning ofLecture III., and placed so as to correspond with the reversedimage shown by a telescope, the Alps may be noticed a littleabove, and to the left of, the large ring-mountain (namedPlato) which is seen close to the edge of the Moon ’s termina-tor ( i.e ., the boundary of its enlightened portion), about ^th ofthe way up it. The long range of the Apennines , slopingdownwards to the left, is seen rather below the middle point ofthe same illuminated edge. Beneath them is a large circularmountain, Archimedes , to the left of which there are twosmaller but similar formations, in the lower one of which(Aristillus) a central cone is very evident. Tycho, 54 miles indiameter, and nearly 3 miles deep (a mountain to which weshall presently make special reference), is not quite £th of thewhole way down the same edge, its "ridges on the left-handcasting a deep shadow, which reaches nearly to the base of itscentral cone. The shadow of the cone may also be distinctlyseen in the photograph. AYe may be allowed to state that wehave the greatest possible pleasure in exhibiting this enlargedcopy of Mr. Rutherford's negative.* It will bear the closestexamination, and may well be inspected by means of a magni-fying glass. It is purely a photograph, an image untouchedby human hand, or by the engraver’s art. Every feature isdepicted by the Moon itself, and we are confident in ouropinion that no more perfect result has as yet been obtainedin lunar photography.
In some parts of the Moon large and comparatively levelregions are met with, of a darkish hue, and in many casessomewhat depressed below the general level. Several of these(e.ff., the Sea of Serenity, the Sea of Vapours, the Sea ofStorms) are still called by names which were long ago givento them under the supposition that they were portions ofwater, or that they bore a certain resemblance to the seas ofthe Earth . This idea is now discountenanced, although it
* We owe the privilege of so doing to Messrs. Kegan Paul , Trench,
& Co., who have most kindly provided the copies.