Publishing history of this Collection: "Arm of the Law" from Fantastic Universe August 1958 "Deathworld" from Astounding Science Fiction January, February and March 1960 "The Ethical Engineer" from Analog Science Fact & Fiction July and August 1963 "The K-Factor" from Analog December 1960 "The Misplaced Battleship" from Astounding Science Fiction April 1960 "Navy Day" from If Worlds of Science Fiction January 1954 "Planet of the Damned" from Analog Science Fact-Science Fiction, Sept.-Nov. 1961 "The Repairman" from Galaxy February 1958 "Sense of Obligation" from Analog Science Fact & Fiction September, October, November 1961 "Toy Shop" from Analog April 1962 "The Velvet Glove" from Fantastic Universe November 1956