it is which started the whole tissue of legendry concerning supernatural aid given the allied armies during the war. This purely fictitious account of an angel army that saved the day at Mons was so vivid that its readers accepted it as truth and obstinately clung to that idea in the face of Mr. Machen's persistent and bewildered explanations that he had invented the whole thing. Editors wrote leading articles about it, ministers preached sermons on it, and the general public preferred to believe in the Mons angels rather than in Arthur Machen. Mr. Machen has shown himself an artist in the supernatural, one whom his generation has not been discerning enough to appreciate. Some of his material is painfully morbid, but his pen is magic and his inkwell holds many dark secrets. In this collection I have attempted to include specimens of a few of the distinctive types of modern ghosts, as well as to show the art of individual stories. Examples of the humorous ghosts are omitted here, as a number of them will be brought together in Humorous Ghost Stories, the companion volume to this. The ghost lover who reads these pages will think of others that he would like to see included—for I believe that readers are more passionately attached to their own favorite ghost tales than to any other form of literature. But critics will admit the manifest impossibility of bringing together in one volume all the famous examples of the art. Some of the well-known tales, particularly the older ones on which copyright has expired, have been reprinted so often as to be almost hackneyed, while others have been of necessity omitted because of the limitations of space. D.S. New York, March, 1921. New York The Willows By ALGERNON BLACKWOOD By ALGERNON BLACKWOOD From The Listener, by Algernon Blackwood. Published in America by E.P. Dutton, and in England by Everleigh Nash, Ltd. By permission of the publishers and Algernon Blackwood. I After leaving Vienna, and long before you come to Buda-Pesth, the Danube enters a region of singular loneliness and desolation, where its waters spread away on all sides regardless of a main channel, and the country becomes a swamp for miles upon