The Best British Short Stories of 1922

When Edward J. O'Brien asked me to cooperate with him in choosing each year's best English short stories, to be published as a companion volume to his annual selection of the best American short stories, I had not realized that at the end of my arduous task, which has involved the reading of many hundreds of stories in the English magazines of an entire year, I should find myself asking the simple question: What is a short story?