Contents: 5 • Limitation on Logic • [Editorial (Astounding)] • essay by John W. Campbell, Jr. [as by The Editor] 8 • Immigrant • novella by Clifford D. Simak 55 • I Made You • short story by Walter M. Miller, Jr. 65 • Final Exam • novelette by Arthur Zirul 95 • In Times To Come (Astounding, March 1954) • [In Times to Come (Astounding)] • essay by The Editor 96 • Topology • essay by J. G. Hocking 111 • Sucker Bait (Part 2 of 2) • serial by Isaac Asimov 140 • Spacesuit Helmet • essay by USAF R&D Command Headquarters 141 • The Analytical Laboratory: December 1953 (Astounding, March 1954) • [The Analytical Laboratory] • essay by The Editor 142 • Brass Tacks (Astounding, March 1954) • [Brass Tacks] • essay by uncredited 142 •  Letter (Astounding, March 1954) • essay by Les Cole 150 • The Reference Library: One More World (Astounding, March 1954) • [The Reference Library] • essay by P. Schuyler Miller and Joseph A. Winter, M.D. [as by P. Schuyler Miller and J. A. Winter, M.D.]