Astounding Stories (Vol. VI No. 2 May, 1931); pulp science fiction and horror. In this issue: DARK MOONCHARLES W. DIFFIN Mysterious, Dark, Out of the Unknown Deep Comes a New Satellite to Lure Three Courageous Earthlings on to Strange Adventure. (A Complete Novelette.) WHEN CAVERNS YAWNEDCAPTAIN S. P. MEEK Only Dr. Bird's Super-Scientific Sleuthing Stands in the Way of Ivan Sarnoff's Latest Attempt at Wholesale Destruction. THE EXILE OF TIMERAY CUMMINGS Young Lovers of Three Eras Are Swept down the Torrent of the Sinister Cripple Tugh's Frightful Vengeance. (Part Two of a Four-Part Novel.) WHEN THE MOON TURNED GREENHAL K. WELLS Outside His Laboratory Bruce Dixon Finds a World of Living Dead Men-and Above, in the Sky, Shines a Weird Green Moon. THE DEATH-CLOUDNAT SCHACHNER AND ARTHUR L. ZAGAT The Epic Exploit of One Who Worked in the Dark and Alone, Behind the Enemy Lines, in the Great Last War.