In addition to the green men there had been three principal races upon Barsoom. The blacks, the whites, and a race of yellow men. As the waters of the planet dried and the seas receded, all other resources dwindled until life upon the planet became a constant battle for survival.
The various races had made war upon one another for ages, and the three higher types had easily bested the green savages of the water places of the world, but now that the receding seas necessitated constant abandonment of their fortified cities and forced upon them a more or less nomadic life in which they became separated into smaller communities they soon fell prey to the fierce hordes of green men.
The result was a partial amalgamation of the blacks, whites and yellows, the result of which is shown in the present splendid race of red men.
I had always supposed that all traces of the original races had disappeared from the face of Mars, yet within the past four days I had found both whites and blacks in great multitudes.
Could it be possible that in some far-off corner of the planet there still existed a remnant of the ancient race of yellow men?
My reveries were broken in upon by a low exclamation from the boy.