In making this change it frees the light-waves it conveyed from
Mars, and retains the light-waves of the objects about it, which is
merely repeating its performance upon leaving Mars. These light-waves of
objects on another globe it now conveys on its return journey to Mars,
entering a receiving instrument and depicting the objects therein
life-size.
"Possessing rays invisible to the human eye, except when agitated by a
substance of its own nature, daylight on a planet becomes an entirely
unnecessary adjunct to observations made with super-radium, and we are
able to explore the dark side of planets and other heavenly bodies, just
as effectually as those illuminated by the sun.
"Thus have we, for seven hundred years, been able to study the country,
cities, streets, and people of Earth. And not only did we note a
remarkable similarity in the people, buildings, and scientific progress
to early Martian ages, but, by the advertisements, placards, and other
street signs we were able to learn the principal languages spoken on
your planet, and these were found to correspond in a remarkable degree
to those in use on Mars, before conditions on our planet made the
adoption of a composite language an absolute necessity.
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