Note: 4 plays All were published here for the first time, the 1912 Preface by Sinclair suggests. The one known to be speculative fiction, "Prince Hagen" is the oldest (from the Preface) and longest. It was privately printed, probably in 1909, for distribution by the author within the theater industry (see at ISFDB as a 1909 novel). The first three plays in the collection, all non-genre probably, are The Naturewoman; The Machine; and The Second-Story Man.