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._ 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 aim has been to produce an account of the chief modern applications of electricity without using technical language or making any statements which are beyond the comprehension of any reader of ordinary intelligence. In this he has succeeded to admiration, and 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., LTD., 38 GREAT RUSSELL STREET POPULAR SCIENCE THE GREAT WORLD'S FARM. Some Account of Nature's Crops and How they are Grown. By SELINA GAYE. With a Preface by Professor BOULGER. With Sixteen Illustrations. Second Edition, 5s. "A fascinating volume of popular science."--_Times._ SUN, MOON, AND STARS. A Book on Astronomy for Beginners. By AGNES GIBERNE. With Coloured Illustrations. Twenty-eighth Thousand. Revised. 5s. THE WORLD'S FOUNDATIONS. Geology for Beginners. By AGNES GIBERNE. With Illustrations. Seventh Thousand. 5s. "The exposition is clear; the style simple and attractive."--_Spectator._ THE OCEAN OF AIR. Meteorology for Beginners. By AGNES GIBERNE. With Illustrations. Fifth Thousand. 5s. "Miss Giberne can be accurate without being formidable, and unites a keen sense of the difficulties of beginners to a full comprehension of the matter in hand."--_Saturday Review._ AMONG THE STARS; or, Wonderful Things in the Sky. By AGNES GIBERNE. With Coloured Illustrations. Tenth Thousand. Revised. 5s. "An attempt to teach astronomy to small children ... it is very well done."--_Saturday Review._