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NEWTON & CO., Ltd., 43, Museum Street, London, W.C.t. 85 MODERN ASTRONOMY. Modern Astronomy is so entirely different in its whole conception and outlook from that which was taught some years ago, and the old theories and methods of thought have been so thoroughly superseded, that it is absolutely essential to have some idea of what Astronomy now is, it education is to mean up-tO'date knowledge. It is with the hope of assisting educationists that these lectures have been prepared visualizing the subject in an easily comprehended form. It was our conviction of the importance of providing only the latest and most accurate and authoritative information for educational work that caused us to ask the help of Mr. Phillips, the Secretary of the Koyal Astronomical Society, and it is his courteous and able assistance alone that enables us to publish this very valuable new series of illustrated lectures on Modern Astronomy. We hope it will prove a successful means of bringing before (hose who know nothing of the marvellous progress of this great science during the past few years, the entire change of outlook caused by the great dis- coveries notably that of Einstein—which have recently revolutionized both rhysics and Astronomy. It is doubtless difficult for anyone who is not an accomplished mathematician and scientist to grasp the full meaning of Einstein's Kelativtty lheory, but the reference to it and the illustrations in Lecture I. ol this series will enable the student to understand something ot what that theory means, and also something of the wonderful influence it' must exercise on the future development of Astronomy and Physical Science. But it is not only the young for whom these Lantern Lectures are suitable i they are intended also for adult audiences, as, not only do they describe the results of the wonderful discoveries that have been recently made, but they give an accurate and able record of the position of Astronomical Science at the present time ( 1928 ), and should further developments take place which increase our knowledge on this subject or vary the theories and ideas at present held, it is in* tended to add such slides and details as may be necessary, to keep them up to date. Without such aid as that given by Mr. Phillips, a course of lectures like this could not have been produced, and we are indebted also to most ot the famous Observatories for assistance in the provision of the ex- cellent sets of slides with which the lectures are illustrated and which help effectively to a clear understanding of this great subject. Permission to use some of their wonderful Astronomical Photographs has been granted by— The Yerkes Observatory, Wisconsin. The Lick Observatory, California. The Mount Wilson Observatory, California. The Lowell Observatory, California. The Observatory, Heidelberg, Germany. The Kodaikanai Observatory,5. India. The Meudon Observatory, France. The Hamburger Observatory, Bergedor. The Royal Observatory, Greenwich. The Cape of Good Hope Observatory S. Africa.