One writer argues that, since all worlds must by analogy be supposed to be inhabited, and since the satellites of Jupiter more resemble worlds than the planet itself, which may be regarded as a kind of secondary sun, it is not improbable that the former are the scenes of life as varied as that of Mars itself; and that infinite ages hence, when these have become too cold for habitation, their giant primary may have gone through those processes which, according to the received theory, have fitted the interior planets to be the home of plants, animals, and, in two cases at least, of human beings.
It was near midnight before the manifest fatigue of the ladies overcame my selfish desire to prolong as much as possible this most interesting visit.

Meteorological science in Mars has been carried to high perfection; and the director warned me that but three or four equally favourable opportunities might offer in the course of the next half year..