[5] The BSI was an outgrowth of Christopher Morley's informal group, "the Three Hours for Lunch Club," which discussed art and literature.
[7] Initial attendees included William Gillette, Vincent Starrett, Alexander Woollcott, and Gene Tunney.
[6][8] In February 1934, Elmer Davis, a friend of Morley, wrote a constitution for the group explaining its purpose and stating that anyone who passed a certain test was eligible to join.
[9] This test, a crossword puzzle by Morley's younger brother Frank, was published in the May 1934 issue of Saturday Review of Literature.
[6] As of 2020, the organization has had a total of 701 members, whose names, years of investiture, and pseudonym are listed in the reference volume Sherlock Holmes and the Cryptic Clues.