ASTOUNDING STORIES 20¢ _On Sale the First Thursday of Each Month_ W. M. CLAYTON, Publisher HARRY BATES, Editor DOUGLAS M. DOLD, Consulting Editor The Clayton Standard on a Magazine Guarantees _That_ the stories therein are clean, interesting, vivid, by leading writers of the day and purchased under conditions approved by the Authors' League of America; _That_ such magazines are manufactured in Union shops by American workmen; _That_ each newsdealer and agent is insured a fair profit; _That_ an intelligent censorship guards their advertising pages. _The other Clayton magazines are:_ ACE-HIGH MAGAZINE, RANCH ROMANCES, COWBOY STORIES, CLUES, FIVE-NOVELS MONTHLY, ALL STAR DETECTIVE STORIES, RANGELAND LOVE STORY MAGAZINE, WESTERN ADVENTURES, and WESTERN LOVE STORIES. _More than Two Million Copies Required to Supply the Monthly Demand for Clayton Magazines._ * * * * * VOL. VI, No. 1 CONTENTS APRIL, 1931 COVER DESIGN H. W. WESSO _Painted in Water-Colors from a Scene in "Monsters of Mars."_ MONSTERS OF MARS EDMOND HAMILTON 4 _Three Martian-Duped Earth-Men Swing Open the Gates of Space That for So Long Had Barred the Greedy Hordes of the Red Planet._ (A Complete Novelette.) THE EXILE OF TIME RAY CUMMINGS 26 _From Somewhere Out of Time Come a Swarm of Robots Who Inflict on New York the Awful Vengeance of the Diabolical Cripple Tugh._ (Beginning a Four-Part Novel.) HELL'S DIMENSION TOM CURRY 51 _Professor Lambert Deliberately Ventures into a Vibrational Dimension to Join His Fiancée in Its Magnetic Torture-Fields._ THE WORLD BEHIND THE MOON PAUL ERNST 64 _Two Intrepid Earth-Men Fight It Out with the Horrific Monsters of Zeud's Frightful Jungles._ FOUR MILES WITHIN ANTHONY GILMORE 76 _Far Down into the Earth Goes a Gleaming Metal Sphere Whose Passengers Are Deadly Enemies._ (A Complete Novelette.) THE LAKE OF LIGHT JACK WILLIAMSON 100 _In the Frozen Wastes at the Bottom of the World Two Explorers Find a Strange Pool of White Fire--and Have a Strange Adventure._ THE GHOST WORLD SEWELL PEASLEE WRIGHT 118 _Commander John Hanson Records Another of His Thrilling Interplanetary Adventures with the Special Patrol Service._ THE READERS' CORNER ALL OF US 134 _A Meeting Place for Readers of Astounding Stories._ Single Copies, 20 Cents (In Canada, 25 Cents) Yearly Subscription, $2.00