Vol. 22, No 4. Contents: 6 • Editorial Mutants • [Editorial (Astounding)] • essay by John W. Campbell, Jr. [as by The Editor] 9 • A Matter of Form • novella by H. L. Gold [as by Horace L. Gold] 50 • The Ephemerae • short story by Edmond Hamilton 61 • Nuisance Value (Part 1 of 2) • serial by Manly Wade Wellman (book publication as The Dark Destroyers 1959) 80 • The Merman • short story by L. Sprague de Camp 91 • Simultaneous Worlds (Part 2 of 2) • serial by Nat Schachner 118 • Helen O'Loy • short story by Lester del Rey 126 • "Let Cymbals Ring!" • short story by Moses Schere [as by M. Schere] 141 • "They Had Rhythm" • [Pvt. Kelton] • short story by Kent Casey 151 • Stored Power • essay by John W. Campbell, Jr. [as by Arthur McCann] 153 • In Times to Come (Astounding, December 1938) • [In Times to Come (Astounding)] • essay by The Editor 154 • The Analytical Laboratory: October 1938 (Astounding, December 1938) • [The Analytical Laboratory] • essay by uncredited 155 •  Letter (Astounding, December 1938) • [Letters: Arthur C. Clarke] • essay by Arthur C. Clarke 156 •  Letter (Astounding, December 1938) • [Letters: John W. Campbell, Jr.] • essay by John W. Campbell, Jr. [as by Arthur McCann] 157 • Science Discussions and Brass Tacks (Astounding, December 1938) • [Brass Tacks] • essay by The Editor 157 • Letters. 【 PREVIOUS ISSUE ← December 1938 → NEXT ISSUE 】