SCIENTIFIC IDEAS OF TO-DAY. A Popular Account, in Non-technical Language, of the Nature of Matter, Electricity, Light, Heat, Electrons, &_c_. &_c_. By CHARLES R. GIBSON, A.I.E.E., Author of "Electricity of To-Day," &c. "Supplies a real need.... Mr. Gibson has a fine gift of exposition."--_Birmingham Post._ ASTRONOMY OF TO-DAY. A Popular Introduction in Non-technical Language. By CECIL G. DOLMAGE, LL.D., F.R.A.S. With frontispiece in colours, & 45 other illustrations. "Dr. Dolmage has absolutely kept to his promise to introduce the reader to an acquaintance with the astronomy of to-day in non-technical language."--_Saturday Review._ ELECTRICITY OF TO-DAY. Its Work and Mysteries Explained. By CHARLES R. GIBSON, A.I.E.E. "Mr. Gibson has given us one of the best examples of popular scientific exposition that we remember seeing. His book may be strongly commended to all who wish to realise what electricity means and does in our daily life."--_The Tribune._ SEELEY & CO., LIMITED THE SCIENCE OF TO-DAY SERIES _With many Illustrations. Extra Crown 8vo. 5s. net._ AERIAL NAVIGATION OF TO-DAY. A Popular Account of the Evolution of Aeronautics. By CHARLES C. TURNER. "If ever the publication of a book was well timed, surely it is the case with this book on aviation.... Of the technical chapters we need only say that they are so simply written as to present no grave difficulties to the beginner who is equipped with an average education."--_Globe._ BOTANY OF TO-DAY. A Popular Account of the Evolution of Modern Botany. By Prof. G.F. SCOTT-ELLIOT, M.A., B.Sc., Author of "The Romance of Plant Life," _&c. &c._ "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 CHARLES R. GIBSON, A.I.E.E., Author of "Electricity of To-Day," _&c._ "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. With frontispiece in colours, & 45 other illustrations. "A lucid exposition much helped by abundant illustrations."--_The Times._ "From cover to cover the book is readable, and every word is intelligible to the layman. Dr. Dolmage displays literary powers of a very high order. Those who read it without any previous knowledge of astronomy will find that a new interest has been added to their lives, and that in a matter of 350 pages they have gained a true conception of the meaning of astronomy."--_The Standard._