atmosphere. This absence of air entails absence of water; it therefore
became manifest that the Selenites, in order to live under such
conditions, must have a special organisation, and differ singularly from
the inhabitants of the earth.

Lastly, thanks to new methods, more perfected instruments searched the
moon without intermission, leaving not a point of her surface
unexplored, and yet her diameter measures 2,150 miles; her surface is
one-thirteenth of the surface of the globe, and her volume
one-forty-ninth of the volume of the terrestrial spheroid; but none of
her secrets could escape the astronomers' eyes, and these clever
_savants_ carried their wonderful observations still further.

Thus they remarked that when the moon was at her full the disc appeared
in certain places striped with white lines, and during her phases
striped with black lines. By prosecuting the study of these with greater
precision they succeeded in making out the exact nature of these lines.
They are long and narrow furrows sunk between parallel ridges, bordering
generally upon the edges of the craters; their length varied from ten to
one hundred miles, and their width was about 1,600 yards. Astronomers
called them furrows, and that was all they could do; they could not
ascertain whether they were the dried-up beds of ancient rivers or not.
The Americans hope, some day or other, to determine this geological
question. They also undertake to reconnoitre the series of parallel
ramparts discovered on the surface of the moon by Gruithuysen, a learned
professor of Munich, who considered them to be a system of elevated
fortifications raised by Selenite engineers. These two still obscure
points, and doubtless many others, can only be definitely settled by
direct communication with the moon.