Contents: 5 • The Nature of Intelligent Aliens • [Editorial (Analog)] • essay by John W. Campbell, Jr. [as by John W. Campbell] 8 • Weyr Search • [Dragonriders of Pern short fiction] • novella by Anne McCaffrey 61 • Toys • short story by Tom Purdom 79 • In Times to Come (Analog, October 1967) • [In Times to Come (Analog)] • essay by The Editor 80 • Political Science—Chinese Style • [Science Fact (Analog)] • essay by Research Group of the Theory of Elementary Particles, Peking 85 • We're Getting There • essay by uncredited 86 • The Judas Bug • novelette by C. C. MacApp [as by Carroll M. Capps] 114 • Free Vacation • [Prodromals] • short story by W. Macfarlane 125 • The Analytical Laboratory: June & July 1967 (Analog, October 1967) • [The Analytical Laboratory] • essay by The Editor 126 • Pontius Pirates • novelette by J. T. McIntosh 162 • The Reference Library: Swinger and Dad (Analog, October 1967) • [The Reference Library] • essay by P. Schuyler Miller 167 • Brass Tacks (Analog, October 1967) • [Brass Tacks] • essay by uncredited.