south and its longitude 50 deg.
west. For away to the north, on the borders of the _Mare Frigoris_, or
Icy Sea, is seen the small _Mare Humboldtianum_, or Humboldt Sea, with a
surface of about 10 thousand square miles. Corresponding to this in the
southern hemisphere lies the _Mare Australe_, or South Sea, whose
surface, as it extends along the western rim, is rather difficult to
calculate. Finally, right in the centre of the lunar disc, where the
equator intersects the first meridian, can be seen _Sinus Medii_, the
Central Gulf, the common property therefore of all the hemispheres, the
northern and southern, as well as of the eastern and western.
Into these great divisions the surface of our satellite resolved itself
before the eyes of Barbican and M'Nicholl. Adding up the various
measurements, they found that the surface of her visible hemisphere was
about 7-1/2 millions of square miles, of which about the two thirds
comprised the volcanoes, the mountain chains, the rings, the islands--in
short, the land portion of the lunar surface; the other third comprised
the "seas," the "lakes," the "marshes," the "bays" or "gulfs," and the
other divisions usually assigned to water.
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