The game of examining the stories as if they were non-fiction began in the early twentieth century. There are early examples of Sherlockian essays by Arthur Bartlett Maurice and Frank Sidgwick, both published in 1902, but neither of these essays received much notice at first. Notable early scholars of the canon included Ronald Knox in Britain and Christopher Morley (founder of The Baker Street Irregulars) in New York. Dorothy L. Sayers, creator of the detective Lord Peter Wimsey, also wrote several essays on Holmesian speculation, later published in "Unpopular Opinions". In the foreword to this book, Sayers notes that