Contents (view Concise Listing)

• 13 • This Atom—Earth • essay by Ray Cummings
• 14 • The Prisoner of Mars (Complete Novel) • serial by Edmond Hamilton (book publication as Tharkol, Lord of the Unknown 1950)
• 14 •  The Prisoner of Mars • interior artwork by H. W. Wesso
• 17 •  Philip Crain, King Lanu • interior artwork by H. W. Wesso
• 20 •  Kay Martin • interior artwork by H. W. Wesso
• 21 •  Surp • interior artwork by H. W. Wesso
• 22 •  Princess Mara • interior artwork by H. W. Wesso
• 23 •  Dandor • interior artwork by H. W. Wesso
• 27 •  The Prisoner of Mars [2] • interior artwork by H. W. Wesso
• 31 •  The Prisoner of Mars [3] • interior artwork by H. W. Wesso
• 39 •  The Prisoner of Mars [4] • interior artwork by H. W. Wesso
• 45 •  The Prisoner of Mars [5] • interior artwork by H. W. Wesso
• 51 •  The Prisoner of Mars [6] • interior artwork by H. W. Wesso
• 98 • The Life Story of Robert A. Millikan: Discoverer of the Cosmic Ray • [They Changed the World] • essay by Jack Binder
• 98 •  The Life Story of Robert A. Millikan: Discoverer of the Cosmic Ray • [They Changed the World] • interior artwork by Jack Binder
• 100 • Pygmalion's Spectacles • (1935) • short story by Stanley G. Weinbaum
• 100 •  Scientifiction Hall of Fame • (1939) • interior artwork by uncredited
• 100 •  Pygmalion's Spectacles • interior artwork by Alex Schomburg
• 111 • The Twist of a Dial • [Thrills in Science] • essay by Mort Weisinger
• 112 • The Inventor Nobody Knew • [Thrills in Science] • essay by Mort Weisinger
• 113 • The Great Prediction • [Thrills in Science] • essay by Mort Weisinger
• 115 • Science Question Box (Startling Stories, May 1939) • [Science Question Box] • essay by The Editor
• 116 • The Lost Hour • short story by Alexander Samalman
• 116 •  The Lost Hour • interior artwork by uncredited
• 119 • The Ether Vibrates (Startling Stories, May 1939) • [The Ether Vibrates] • essay by The Editor
• 119 •  Letter (Startling Stories, May 1939): Binder's Best • essay by Thomas S. Gardner
• 119 •  Letter (Startling Stories, May 1939): Finlay Magnificent • essay by Harry Warner, Jr.
• 119 •  Letter (Startling Stories, May 1939): Favors Finlay • essay by Ralph C. Hamilton
• 119 •  Letter (Startling Stories, May 1939): The Flame Burned Him! • [Letters: Forrest J. Ackerman] • essay by Forrest J. Ackerman
• 121 •  Letter (Startling Stories, May 1939): The Weinbaum Spell • essay by A. Langley Searles [as by Langley Searles]
• 121 •  Letter (Startling Stories, May 1939): Williamson Wanted • essay by J. Harvey Haggard
• 124 • Scientific Crossword Puzzle (Startling Stories, May 1939) • [Scientific Crossword Puzzle: Startling Stories] • essay by uncredited
• 126 • Meet the Author (Startling Stories, May 1939) • essay by Edmond Hamilton
• 128 • Reviewing the Science Fiction Fan Publications (Startling Stories, May 1939) • essay by uncredited
• 128 •   Review: Yearbook of Science, Weird and Fantasy Fiction - 1938 by Bob Tucker • review by uncredited
• 129 • Forecast for the Next Issue (Startling Stories, May 1939) • essay by The Editor