, a smaller area, parts of which have a dusky
green tint, from whence to the northward we had a view over the Sea of
Serenity, another deep depression nearly as large as the Sea of
Tranquillity, and much of which is a light green colour.

Then we came again to the Sea of Showers, a large "sea" having an area
of 340,000 square miles; and, still moving eastward, the great lunar
"Ocean of Storms" soon came into view. This covers a very large portion
of the eastern and north-eastern part of the moon's surface, and, with
all its bays and indentations, is estimated to be two million square
miles in extent.

I, however, again reminded them that, although these areas are termed
seas and oceans, no water exists there now, whatever may have been the
case in the long distant past. They are now only large depressions, and
not often level but intersected by hills, ridges, and even mountains.

As we passed along I called their particular attention to the
magnificent "Bay of Rainbows" on the north-eastern coast of the Sea of
Showers. "From Cape Laplace (9000 feet high) on the western extremity,
to Cape Heraclides (4000 feet high) on the eastern extremity, this great
bay is about 140 miles across, the depth of its curvature being over
eighty miles. It bears a very strong resemblance to many large bays on
our sea-coasts in various parts of the world, but I am not aware of any
such bay which is bordered by a mass of such lofty mountains as this is.

"We are looking at it now under a high sun, but when the sun has only
just risen sufficiently high to illuminate all those high mountains,
whilst the lower surroundings are still in shadow, the great bay
presents in the telescope the appearance of a brilliant luminous arch
springing from the lighted part of the moon and extending far out over
the dark part of the disc.

"Farther eastward, and lower down on the Ocean of Storms, you will
observe what is admitted by all to be the very brightest large formation
upon the moon, viz. Aristarchus--a ring-plain nearly thirty miles in
diameter, the floor of which is 5000 feet below the surface level. It
possesses a central mountain, very difficult to measure on account of
the general brightness, but believed to be about 1300 feet high.
Well-defined terraces are seen on the mountain walls enclosing the area,
and many external ridges are connected with the walls, especially to the
south. This formation is evidently covered with some substance which