THE MOON.

7 5

comparable to them is found upon the Earth , although there isa considerable resemblance between certain regions (such as theneighbourhood of Vesuvius ), in which we know that volcanicageucy has been at work, and some of the smaller groupsof craters upon the Moon . This has well been shown in adiagram by Messrs. Nasmyth and Carpenter, in which thedistrict surrounding Vesuvius is contrasted with a similar por-tion of the Moon. We append from Admiral Smyth ’s SpeculumIlartwellianum (now somewhat rare) a copy of a drawing of

Pig. XIX.—The great crater of Tenenffe.

—ai-‘

the great crater of Teneriffe ,—“ eight miles in diameter, withits parasitic cones and peak, the latter 12,198 feet high,”—which is undoubtedly a volcanic formation. It may certainlybear interesting comparison with many of the lunar mountains,or craters.

We have upon the whole strong reasons for believing thatthe lunar formations are in like manner most probably ofvolcanic origin. Nevertheless, so great is the diameter ofmany of the larger circles of mountains, that it is hard toconceive that they can have been produced by central