as Thrilling Detective and Thrilling Love Stories. These were run by Leo Margulies, who had hired Mort Weisinger (among others) as the workload increased in the early 1930s. Weisinger was already an active science fiction fan, and when Wonder Stories was acquired, Margulies involved him in the editorial work. Margulies' group worked as a team, with Margulies listed as editor-in-chief on the magazines and having final say. However, since Weisinger knew science fiction well, Weisinger was quickly given more leeway, and bibliographers generally list Weisinger as the editor for this period of the magazine's history. The title was changed to Thrilling Wonder Stories to match the rest of the "Thrilling" line. The first issue appeared in August 1936—four months after the last Gernsback Wonder Stories appeared. Wonder Stories had been monthly until the last few Gernsback issues; Thrilling Wonder was launched on a bimonthly schedule. In February 1938 Weisinger asked for reader feedback regarding the idea of a companion magazine; the response was positive, and in January 1939 the first issue of Startling Stories appeared, alternating months with Thrilling Wonder. A year later Thrilling Wonder went monthly; this lasted fewer than eighteen months, and the bimonthly schedule resumed after April 1941. Weisinger left that summer and was replaced at both Startling and Thrilling Wonder by Oscar J. Friend, a pulp writer with more experience in Westerns than science fiction, though he had published a novel, The Kid from Mars, in Startling Stories just the year before. In mid-1943 both magazines went to a quarterly schedule, and at the end of 1944 Friend was replaced in his turn by Sam Merwin, Jr. The quarterly schedule lasted until well after World War II ended: Thrilling Wonder returned to a bimonthly schedule with the December 1946 issue and again alternated with Startling which went bimonthly in January 1947. Merwin left in 1951 in order to become a freelance editor, and was replaced by Samuel Mines, who had worked for Ned Pines since 1942. The Thrilling Wonder logo, a winged man against the background of a glass mountain was taken from the Noel Loomis story, "The Glass Mountain." By the summer of 1949 Street & Smith, one of the largest pulp publishers, had shut down every one of their pulps. This format was dying out, though it took several more years before the pulps completely disappeared from the newsstands. Both Thrilling Wonder and Startling