Produced by Greg Weeks and the Online Distributed Proofreading Team at https://www.pgdp.net 20c ASTOUNDING STORIES OF SUPER-SCIENCE _On Sale the First Thursday of Each Month_ W. M. CLAYTON, Publisher HARRY BATES, Editor DR. DOUGLAS M. DOLD, Consulting Editor * * * * * [Illustration] 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 FOREST AND STREAM. _More than Two Million Copies Required to Supply the Monthly Demand for Clayton Magazines._ * * * * * VOL. III. No. 3 CONTENTS SEPTEMBER, 1930 COVER DESIGN H. W. WESSOLOWSKI _Painted in Water-Colors from a Scene in "Marooned Under the Sea."_ A PROBLEM IN COMMUNICATION MILES J. BREUER, M.D. 293 _The Delivery of His Country into the Clutches of a Merciless, Ultra-Modern Religion Can Be Prevented Only by Dr. Hagstrom's Deciphering an Extraordinary Code._ JETTA OF THE LOWLANDS RAY CUMMINGS 310 _Fantastic and Sinister Are the Lowlands into Which Philip Grant Descends on His Dangerous Assignment._ (Beginning a Three-Part Novel.) THE TERRIBLE TENTACLES, OF L-472 SEWELL PEASLEE WRIGHT 332 _Commander John Hanson of the Special Patrol Service Records Another of His Thrilling Interplanetary Assignments._ MAROONED UNDER THE SEA PAUL ERNST 346 _Three Men Stick Out a Strange and Desperate Adventure Among the Incredible Monsters of the Dark Sea Floor._ (A Complete Novelette.) THE MURDER MACHINE HUGH B. CAVE 377 _Four Lives Lay Helpless Before the Murder Machine, the Uncanny Device by Which Hypnotic Thought Waves Are Filtered Through Men's Minds to Mold Them Into Murdering Tools._ THE ATTACK FROM SPACE CAPTAIN S. P. MEEK 390 _From a Far World Came Monstrous Invaders Who Were All the More Terrifying Because Invisible._ EARTH, THE MARAUDER ARTHUR J. BURKS 408 _Martian Fire-Balls and the Terrific Moon-Cubes Wreak Tremendous Destruction on Helpless Earth in the Final Death Struggle of the Warring Worlds._ (Conclusion.) THE READERS' CORNER ALL OF US 423 _A Meeting Place for Readers of Astounding Stories._