Vol. 23, No 1. Contents: 5 • Apologia • [Editorial (Astounding)] • essay by John W. Campbell, Jr. [as by The Editor] 9 • Cloak of Aesir • [Sarn] • novella by John W. Campbell, Jr. [as by Don A. Stuart] 43 • An Electric Battery—2,000 Years Ago • essay by Willy Ley 45 • Follow the Bouncing Ball • [Josh McNab] • short story by Arthur J. Burks 57 • Cosmic Engineers (Part 2 of 3) • serial by Clifford D. Simak 88 • Toward the Superman • essay by Richard Tooker 94 • Breeding for Size • essay by uncredited 95 • Star Crash • [Pvt. Kelton] • short story by Kent Casey 109 • Children of the "Betsy B" • short story by Malcolm Jameson 118 • The Analytical Laboratory: January 1939 (Astounding, March 1939) • [The Analytical Laboratory] • essay by The Editor 119 • Problem in Murder • novelette by H. L. Gold 140 • In Times to Come (Astounding, March 1939) • [In Times to Come (Astounding)] • essay by The Editor 141 • Beyond the Sun • short story by D. L. James 154 • Science Discussions and Brass Tacks (Astounding, March 1939) • [Brass Tacks] • essay by The Editor 154 • Letters. 【 PREVIOUS ISSUE ← March 1939 → NEXT ISSUE 】