In so far as I have been able to determine, nothing by way of general criticism or comment has previously been written on the subject of Greek plots in twentieth century tragedy, although individual writers have themselves admitted a certain indebtedness to their sources, and comments regarding the specific plays which I have cited, of course, mention a Greek origin. As regards the whole field of contemporary drama, however, I believe that no treaties earlier than this one has discussed the prevalence of Greek plots among twentieth century dramas.