“A very striking book, revelation follows revelation, and magnificent stories of fighting & heroism at sea come practically on every page. One of the few war books which will survive the next 10 years.”--_Liverpool Courier._ AIRCRAFT OF TO-DAY. A Popular Account of the Conquest of the Air. By MAJ. CHARLES C. TURNER, R.A.F. With 62 Illustrations. “Maj. Turner is well known as an authority on aeronautics. Of real value.”--_Aberdeen Journal._ GEOLOGY OF TO-DAY. A Popular Introduction in Simple Language. By J. W. GREGORY, F.R.S., D.Sc., Professor of Geology at the University of Glasgow. With 55 Illustrations. Extra Crown 8vo. “An ideal introduction to a fascinating science. The romance and reality of the earth most brilliantly and soundly presented.”--_Globe._ SUBMARINE ENGINEERING OF TO-DAY. By C. W. DOMVILLE-FIFE, Author of “Submarines of the World’s Navies,” _&c._ BOTANY OF TO-DAY. A Popular Account of the Evolution of Modern Botany. By Prof. G. F. SCOTT-ELLIOT, M.A., B.Sc., F.L.S. “This most entertaining and instructive book. It is the fruit of wide reading and much patient industry.”--_Globe._ SCIENTIFIC IDEAS OF TO-DAY. A Popular Account, in Non-technical Language, of the Nature of Matter, Electricity, Light, Heat, Electrons, _&c. &c._ By C. R. GIBSON, F.R.S.E. Extra Crown 8vo. “As a knowledgeable writer, gifted with the power of imparting what he knows in a manner intelligible to all, Mr. C. R. Gibson has established a well-deserved reputation.”--_Field._ ASTRONOMY OF TO-DAY. A Popular Introduction in Non-technical Language. By CECIL G. DOLMAGE, LL.D., F.R.A.S. 46 Illustrations. Extra Crown 8vo. “A lucid exposition much helped by abundant illustrations.”--_The Times._ ELECTRICITY OF TO-DAY. Its Work and Mysteries Explained. By CHARLES R. GIBSON, F.R.S.E. Extra Crown 8vo. “One of the best examples of popular scientific exposition that we remember seeing.”--_The Tribune._ ENGINEERING OF TO-DAY. A Popular Account of the Present State of the Science. By T. W. CORBIN. 39 Illustrations. Ex. Cr. 8vo. “Most attractive and instructive.”--_Record._ MEDICAL SCIENCE OF TO-DAY. A Popular Account of recent Developments. By WILLMOTT-EVANS, M.D., B.Sc., F.R.C.S. “A very Golconda of gems of knowledge.”--_Manchester Guardian._ MECHANICAL INVENTIONS OF TO-DAY. An Interesting Description of Modern Mechanical Inventions. By THOMAS W. CORBIN. “In knowledge and clearness of exposition it is far better than most works of a similar character and aim.”--_Academy._ PHOTOGRAPHY OF TO-DAY. A Popular Account of the Origin, Progress, and Latest Discoveries. By H. CHAPMAN JONES, F.I.C., F.C.S., Pres. R.P.S.; Lecturer on Photography at Imperial College of Science. “An admirable statement of the development of photography from its very beginning to the present time.”--_Journal of Photography._