A great brain in the center of the moon, formed of an unknown life-substance allied both to protoplasm and the radio-active minerals. It is growing old, and requires an increasing amount of food — animal food. It has devoured nearly all the underground inhabitants of the moon, and begins sending out waves of thought-attraction to the earth. Scores of rocket-ships start for the moon — and none of them return.

^xxx^ xxx was added by Smith.
[xxx] xxx was deleted by Smith.