Between January 19th, 1900, and April 4th, 1905, I read before the Musical Association of London five papers dealing with the Development of National Opera in Russia, covering a period from the first performance of Glinka's A Life for the Tsar in 1836, to the production of Rimsky-Korsakov's opera The Tsar's Bride, in 1899. These lectures were illustrated by the following artists: the late Mrs. Henry J. Wood, Miss Grainger Kerr, Mr. Seth Hughes, Mr. Robert Maitland; Sir (Mr.) Henry J. Wood and Mr. Richard Epstein at the piano. While using these lectures as the scaffolding of my present book, I have added a considerable amount of new material, amassed during ten years unremitting research into my subject. The additions concern chiefly the earlier phases of Russian music, and the operas that have appeared since 1900.