Vol 49, No 4. Contents: 6 • Uncertainty Principle • [Editorial (Astounding)] • essay by John W. Campbell, Jr. [as by The Editor] 9 • The Specter General • novella by Theodore R. Cogswell [as by Theodore Cogswell] 58 • The Ghost Town • novelette by Donald Kingsbury 81 • In Times to Come (Astounding, June 1952) • [In Times to Come (Astounding)] • essay by The Editor 82 • Transistors • essay by John R. Pierce [as by J. J. Coupling] 95 • Blood Bank • novella by Walter M. Miller, Jr. 139 • Ascent Into Chaos • novelette by M. C. Pease 159 • The Reference Library: Readers' Choice (Astounding, June 1952) • [The Reference Library] • essay by P. Schuyler Miller 166 • Brass Tacks (Astounding, June 1952) • [Brass Tacks] • essay by The Editor.