Vol 23, No 2. Contents: 6 • Jackpot! • [Editorial (Astounding)] • essay by John W. Campbell, Jr. [as by The Editor] 9 • Worlds Don't Care • novelette by Nat Schachner 30 • The Cover • essay by The Editor 31 • Catalyst Poison • short story by Malcolm Jameson 42 • The Analytical Laboratory: February 1939 (Astounding, April 1939) • [The Analytical Laboratory] • essay by The Editor 42 • In Times to Come (Astounding, April 1939) • [In Times to Come (Astounding)] • essay by The Editor 43 • One Against the Legion (Part 1 of 3) • [Legion of Space • 3] • serial by Jack Williamson 73 • Rope Trick • novelette by Otto Binder [as by Eando Binder] 89 • Revolt • novelette by A. M. Phillips 111 • The Cache • short story by Harry Walton 117 • Cosmic Engineers (Part 3 of 3) • serial by Clifford D. Simak 151 • Letters. 【 PREVIOUS ISSUE ← April 1939 → NEXT ISSUE 】