Their highest summit towers to a height of 22,606 feet above the surface of the lunar disc.
At the same time the survey of the moon was being completed; she appeared riddled with craters, and her essentially volcanic nature was affirmed by each observation.

From the absence of refraction in the rays of the planets occulted by her it is concluded that she can have no 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.