Of the larger Nietzschean commentaries in English the best is "Friedrich Nietzsche: His Life and Work," by M. A. Mügge. Appended to it is a bibliography of 850 titles--striking evidence of the attention that Nietzsche's ideas have gained in the world. Other books that will be found useful are "The Quintessence of Nietzsche," by J. M. Kennedy; "Nietzsche: His Life and Works," by Anthony M. Ludovici; "The Gospel of Superman," by Henri Lichtenberger, translated from the French by J. M. Kennedy; "The Philosophy of Nietzsche," by Georges Chatterton-Hill, and "The Philosophy of Friedrich Nietzsche," by Grace Neal Dolson, Ph. D., this last a pioneer work of permanent value. Lesser studies are to be found in "Friedrich Nietzsche," by A. R. Orage; "Nietzsche as Critic, Philosopher, Poet and Prophet," by Thomas Common; "Friedrich Nietzsche and His New Gospel," by Emily S. Hamblen, and "Nietzsche," by Paul Elmer More. Interesting discussions of various Nietzschean ideas are in "The Revival of Aristocracy," by Dr. Oscar Levy; "Who is to be Master of the World?" by A. M. Ludovici; "On the Tracks of Life," by Leo G. Sera, translated from the Italian by J. M. Kennedy; "Nietzsche and Art," by A. M. Ludovici, and "The Mastery of Life," by G. T. Wrench. Selections from Nietzsche's writings are put together under subject headings in "Nietzsche in Outline and Aphorism," by A. R. Orage; "Nietzsche: His Maxims," by J. M. Kennedy, and "The Gist of Nietzsche," by H. L. Mencken. An elaborate and invaluable summary of all Nietzsche's writings, book by book, is to be found in "What Nietzsche Taught," by Willard H. Wright. This volume, the fruit of very diligent labor, is admirably concise and well-ordered. The standard biography of Nietzsche is "_Das Leben Friedrich Nietzsches_" by Frau Förster-Nietzsche, a large work in three volumes. In 1911 Frau Förster-Nietzsche prepared a shorter version and this has since been done into English by A. M. Ludovici, and published in two volumes, under the title of "The Life of Nietzsche." Unluckily, so devoted a sister was not the best person to deal with certain episodes in the life of her brother and hero. The gaps she left and the ameliorations she attempted are filled and corrected in "The Life of Friedrich Nietzsche," by Daniel Halévy, translated from the French by J. M. Hone, with an extraordinarily brilliant introduction by T. M. Kettle, M. P.