Astounding Stories, May 1931 br VARIOUS ( - ) and Nat SCHACHNER (1895 - 1955) br This issue of the science-fiction magazine includes a novella by Charles W. Diffin titled "Dark Moon" and several short stories, including "When Caverns Yawned," "When the Moon Turned Green," and "The Death-Cloud." There is also a second part of "The Exile of Time" by Ray Cummings.