Vol. 23, no 4. Contents: 6 • Future Tense • [Editorial (Astounding)] • essay by John W. Campbell, Jr. [as by The Editor] 9 • Hermit of Mars • novelette by Clifford D. Simak 28 • "Sensitive Instrument • essay by uncredited 29 • When the Future Dies • short story by Nat Schachner 44 • The Analytical Laboratory: April 1939 (Astounding, June 1939) • [The Analytical Laboratory] • essay by The Editor 44 • In Times to Come (Astounding, June 1939) • [In Times to Come (Astounding)] • essay by The Editor 45 • The Morons • novelette by Harl Vincent 65 • Pressure • short story by Ross Rocklynne 79 • Done in Oil • [Josh McNab] • novelette by Arthur J. Burks 103 • Design for Life (Part 2 of 2) • essay by L. Sprague de Camp 116 •  Letter (Astounding, June 1939) • [Letters: Willy Ley] • essay by Willy Ley 116 •  Letter (Astounding, June 1939) • essay by A. Arthur Smith 117 • Science Discussions and Brass Tacks (Astounding, June 1939) • [Brass Tacks] • essay by The Editor 120 • Pandora's Icebox • essay by Philip M. Morse 125 • One Against the Legion (Part 3 of 3) • [Legion of Space • 3] • serial by Jack Williamson. 【 PREVIOUS ISSUE ← June 1939 → NEXT ISSUE 】