The writer will offer no apology for making this experiment. His disqualifications are manifest. But such work needs to be done by as many people as possible, he was free to make his contribution, and he was greatly attracted by the task. He has read sedulously and made the utmost use of all the help he could obtain. There is not a chapter that has not been examined by some more competent person than himself and very carefully revised. He has particularly to thank his friends Sir E. Ray Lankester, Sir H. H. Johnston, Professor Gilbert Murray, and Mr. Ernest Barker for much counsel and direction and editorial help. Mr. Philip Guedalla has toiled most efficiently and kindly through all the proofs. Mr. A. Allison, Professor T. W. Arnold, Mr. Arnold Bennett, the Rev. A. H. Trevor Benson, Mr. Aodh de Blacam, Mr. Laurence Binyon, the Rev. G. W. Broomfield, Sir William Bull, Mr. L. Cranmer Byng, Mr. A. J. D. Campbell, Mr. A. Y. Campbell, Mr. L. Y. Chen, Mr. A. R. Cowan, Mr. O. G. S. Crawford, Dr. W. S. Culbertson, Mr. R. Langton Cole, Mr. B. G. Collins, Mr. J. J. L. Duyvendak, Mr. O. W. Ellis, Mr. G. S. Ferrier, Mr. David Freeman, Mr. S. N. Fu, Mr. G. B. Gloyne, Sir Richard Gregory, Mr. F. H. Hayward, Mr. Sydney Herbert, Dr. Fr. Krupicka, Mr. H. Lang Jones, Mr. C. H. B. Laughton, Mr. B. I. Macalpin, Mr. G. H. Mair, Mr. F. S. Marvin, Mr. J. S. Mayhew, Mr. B. Stafford Morse, Professor J. L. Myres, the Hon. W. Ormsby-Gore, Sir Sydney Olivier, Mr. R. I. Pocock, Mr. J. Pringle, Mr. W. H. R. Rivers, Sir Denison Ross, Dr. E. J. Russell, Dr. Charles Singer, Mr. A. St. George Sanford, Dr. C. O. Stallybrass, Mr. G. H. Walsh, Mr. G. P. Wells, Miss Rebecca West, and Mr. George Whale have all to be thanked for help, either by reading parts of the MS. or by pointing out errors in the published parts, making suggestions, answering questions, or giving advice. The amount of friendly and sympathetic assistance the writer has received, often from very busy people, has been a quite extraordinary experience. He has met with scarcely a single instance of irritation or impatience on the part of specialists whose domains he has invaded and traversed in what must have seemed to many of them an exasperatingly impudent and superficial way. Numerous other helpful correspondents have pointed out printer’s errors and minor slips in the serial publication which preceded this book edition, and they have added many useful items of information, and to those writers also the warmest thanks are due. But of course none of these generous helpers are to be held responsible for the judgments, tone, arrangement, or writing of this _Outline_. In the relative importance of the parts, in the moral and political implications of the story, the final decision has necessarily fallen to the writer. The problem of illustrations was a very difficult one for him, for he had had no previous experience in the production of an illustrated book. In Mr. J. F.