TYPED LETTER SIGNED (TLS). 1/2 page on WEIRD TALES letterhead, signed "Mac", dated 10 January 1945, to "Dear August" [August Derleth]. Thanks Derleth for his letter of January 2, and responds to his comments about a recent issue of WEIRD TALES. She promises to avoid a "consistently flippant" tone; says she's gratified that "you agree with us that [Ray] Bradbury is a good addition to the list"; observes that WEIRD TALES readers "write us very much more frequently than those of SHORT STORIES." Assures Derleth that his "friendship for the magazine is one of out most valued assets... ." Arkham House in 1945 was ramping up its production, issuing six titles that year, on its way towards becoming the dominant specialty press publisher of supernatural fiction. McIlwraith was the third editor at WEIRD TALES, overseeing issues from May 1940 through September 1954, a period of decline, admittedly, after the magazine's heyday in the 1920s and 1930s. The letter documents a connection between the most important periodical and book markets for weird fiction in the mid-century period. Faint fold creases short closed tear in left margin, near fine overall. (#116742).