Startling featured a novel in each issue, with Stanley G. Weinbaum's The Black Flame in its first issue. Other SF authors whose novels were published in subsequent issues included Jack Williamson, Edmond Hamilton, Fredric Brown, Arthur C. Clarke, and Henry Kuttner.
The letter column was called "The Ether Vibrates," and fanzine reviews (giving prices and addresses) became a regular feature, the first such in any prozine. (The letter column featured Sergent Saturn and his drink, Xeno — Sergeant Saturn greatly embarrassed many fans.)
The total run of Startling Stories was 99 issues.
A tribute to Startling Stories by Jon D. Swartz appeared in the May, 2016 issue (Volume 75, Number 5) of The National Fantasy Fan.
For more on the magazine, see http://www.sf-encyclopedia.com/entry/startling_stories