In this new stage of copyright development, a comprehensive work on copyright seemed desirable, especially with reference to the new American code. Neither Eaton S. Drone nor George Haven Putnam were disposed to enter upon the task, which has therefore fallen to the present writer. He hopes that his participation for the last twenty-five years in copyright development,--during which, as editor of the _Publishers' Weekly_ and of the _Library Journal_, he has had occasion to keep watch of copyright progress, and as vice-president of the American (Authors) Copyright League, he has taken part in the copyright conferences and hearings and in the drafting of the new code,--will serve to make the present volume of use to his fellow members of the Authors Club and to like craftsmen, as well as to publishers and others, and aid in clarifying relations and preventing the waste and cost of litigation among the coordinating factors in the making of books and other forms of intellectual property. {Sidenote: Authorities and acknowledgments} The present work includes some of the historical material of the Bowker-Solberg volume of 1886, "Copyright, its law and its literature." This material has been verified, extended and brought up to date, especially in the somewhat detailed sketch of the copyright discussions and legislation resulting in the "international copyright amendment" of 1891 and the code of 1909. The volume is in this respect practically, and in other respects entirely new. It has had the advantage of the cordial co-operation of the copyright authorities at Washington, especially the Librarian of Congress, Herbert Putnam, and the Register of Copyrights, Thorvald Solberg; also of helpful courtesy from the Canadian Minister of Agriculture in the recent Laurier administration, Sidney Fisher, and the Canadian Registrar of Copyrights, P. E. Ritchie, and of Prof. Ernest Roethlisberger, editor of the _Droit d'Auteur_, and one of the best authorities on international copyright. This acknowledgment of obligation is not to be taken as assuming for the work official sanction and authority, though so far as practicable, it reflects the opinions of the best authorities. The writer has also consulted freely--but it is hoped always within the limits of "fair use"--the best law book writers, especially Drone, Copinger, Colles and Hardy, and MacGillivray, to whom acknowledgment is made in the several chapters. Acknowledgment is also made for the courtesies of Sir Frederick Macmillan, G. Herbert Thring, secretary of the British Society of Authors, and others numerous beyond naming. But most of all the writer is indebted to the intelligent and capable helpfulness of Carl L. Jellinghaus, who as private secretary, has been both right hand and eyes to the writer, and besides participating in the work of research, is largely responsible for the index and other "equipment" of the volume. {Sidenote: Method and form}