“A sane, temperate and suggestive survey of a field of inquiry which is slowly but surely pushing to the front.”--_Times Literary Supplement._ “His exposition of the case for psychic research is lucid and interesting.”--_Scotsman._ “Displays the right temper, admirably conceived, skilfully executed.”--_Liverpool Post._ =Aeolus=, or the Future of the Flying Machine. By OLIVER STEWART. “Both his wit and his expertness save him from the nonsensical-fantastic. There is nothing vague or sloppy in these imaginative forecasts.”--_Daily News._ “He is to be congratulated. His book is small, but it is so delightfully funny that it is well worth the price, and there really are sensible ideas behind the jesting.”--_Aeroplane._ =Stentor=, or the Press of To-Day and To-Morrow. By DAVID OCKHAM. “A valuable and exceedingly interesting commentary on a vital phase of modern development.”--_Daily Herald._ “Vigorous and well-written, eminently readable.”--_Yorkshire Post._ “He has said what one expects any sensible person to say about the ‘trustification’ of the Press.”--_Spectator._ =Rusticus=, or the Future of the Countryside. By MARTIN S. BRIGGS, F.R.I.B.A. “Few of the 50 volumes, provocative and brilliant as most of them have been, capture our imagination as does this one.”--_Daily Telegraph._ “The historical part is as brilliant a piece of packed writing as could be desired.”--_Daily Herald._ “Serves a national end. The book is in essence a pamphlet, though it has the form and charm of a book.”--_Spectator._ =Janus=, or the Conquest of War. By WILLIAM MCDOUGALL, M.B., F.R.S. “Among all the booklets of this brilliant series, none, I think is so weighty and impressive as this. It contains thrice as much matter as the other volumes and is profoundly serious.”--Dean Inge, in _Evening Standard_. “A deeply interesting and fair-minded study of the causes of war and the possibilities of their prevention. Every word is sound.”--_Spectator._ =Vulcan=, or the Future of Labour. By CECIL CHISHOLM. “Of absorbing interest.”--_Daily Herald._ “No one, perhaps, has ever condensed so many hard facts into the appearance of agreeable fiction, nor held the balance so nicely between technicalities and flights of fancy, as the author of this excellent book in a brilliant series. _Vulcan_ is a little book, but between its covers knowledge and vision are pressed down and brimming over.”--_Spectator._ =Hymen=, or the Future of Marriage. By NORMAN HAIRE.