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Rh and preparation of bibliography rendered by Dr. John L. Haney, by my colleagues in the English Department, Dr. A. C. Baugh, Mr. F. A. Laurie, Jr., Mr. Clement Foust, and by my Assistant, Mr. R. A. Robinson. The greatest help of all, however, came from her to whom this book is dedicated and for whose service there can be no adequate acknowledgment.

University of Pennsylvania, October, 1916.

The Editor has taken the opportunity of the fourth printing of the collection to bring up to date the references to the work of living playwrights, including the dates of performance of plays produced since October, 1916. Dates of revivals of the older plays have also been indicated and the most significant plays and works of reference published since that date have been noted. These additions to the Bibliography have been made to the individual chapters where they refer to the dramatists included in this volume. In addition, a list of the most important works in the general field of American Drama has been added to the General Bibliography at the end of the volume.

The Editor takes pleasure in acknowledging many kind expressions of appreciation and helpful criticism which he has reflected in the revision so far as was possible. If he had had no other reward than the satisfaction which has come to him from the recent growth of interest in our native drama, which perhaps this volume and those whose publication it has inspired, have had their share in producing, he would have been rewarded for the labor of preparing it.

April, 1920.