I have resisted strenuously all temptation to choose or to annotate specimens on general grounds of æsthetic enjoyment, apart from the distinct study of verse-forms. Yet it would be useless to deny having sometimes made choice of particular verses, all other considerations being equal, for their poetic or literary value over and above their prosodical. I shall not claim for the collection what Boswell did for Dr. Johnson's Dictionary, that "he was so attentive in the choice" of the illustrative passages "that one may read page after page ... with improvement and pleasure;" yet I may say that, so far from fearing that the enjoyment of any poem will be injured by a proper attention to the elements of its metrical form, it is my hope that many a haunting verse may linger, a perpetual possession of beauty, in the memory of the student who first found it here classified under a technical name. Many obligations are to be acknowledged to scholars of whose advice I have availed myself. Most kindly aid has been received from Professor G. L. Kittredge and Dr. Fred N. Robinson, of Harvard University; from Professor Felix E. Schelling, of the University of Pennsylvania; from my friend, Mr. H. P. Earle, of Stanford University; and from my colleague, Dr. Ewald Flügel. My obligation to Schipper's monumental works on English verse will be obvious to every scholar. They suggested many of the specimens of verse-forms, and are also represented by translations or paraphrases in the notes; references to Schipper, without full title, are to the _Englische Metrik_,--the larger work. I have also made thankful use of Mr. John Addington Symonds's essays on Blank Verse, and of Professor Corson's _Primer of English Verse_,--both somewhat unscientific but highly suggestive works. The section on Artificial French Forms obviously owes very much to Mr. Gleeson White's _Ballades and Rondeaus_. A book to which my obligation is out of all proportion to the number of actual quotations from it is Mr. J. B. Mayor's _Chapters on English Metre_. This modest but satisfying volume seemed to me, when I first was taking up the study of English verse, to be a grateful relief from the thorny and often fruitless discussions with which the subject had been overgrown; and in returning to it again and again, I have never failed to renew the impression. Its suggestions underlie a good part of the system of classification and terminology adopted for this book. The new and enlarged edition came to hand too late for use, but I was able to include references to it in the notes.