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When, a few years ago, the publication of Elsevier's Encyclo pa:dia of Organic Chemistry was suspended, it seemed desirable to complete-on account of its monographic character-the steroid section in accordance with the original conception. One conside ration in favour thereof, among others, was that the steroid section of Beilstein's Handbuch will not be available for some years to come, so that also to those using Beilstein the present publication is a valuable help in bridging the gap. In view of the undiminished activity in this special field- equally important to chemists, bio chemists, and the medical world - the hope that the completion of this section will meet the needs of a wide circle of readers ap pears tobe justified. Altogether three more volumes are planned for the Supplement, the first of which, now presented, covers the steroid Oxo-com pounds, the Iiterature having been consulted up to the end of 1946 in conformity with the previous volumes of the steroid Supplement. Where, however, important additions and correc tions are concerned, Iiterature up to the most recent date has been taken into account. In treating the subject matter the same prin ciples have been followed as in the previous volumes of this section. Editorship remains in the competent hands of Dr. F. RADT, who has contributed a considerable proportion of the matter treated in this volume. He is assisted by Dr. A. GEORG and Dr. DoRA STERN.

Structure of the Moon's Surface focuses on the importance of certain features of the Moon's surface that have frequently been disregarded in the past, largely because of lack of knowledge of them. Topics covered include the librations of the Moon; height determinations of the points on the lunar surface; luminous intensity and luminescence of the lunar rocks; the color of moonlight and composition of the Moon's surface; and the Moon's temperature and atmosphere. This book is comprised of 14 chapters and begins with a review of important physical problems associated with the Moon, including its motion and figure as well as the luminous intensity and luminescence of its rocks. The following chapters discuss the polarization of light reflected by the Moon; the problem of the Moon's atmosphere; the probable nature of the Moon's surface; and changes occurring on the Moon. The Moon's ray and grid systems, lattice patterns, rilles and faults, and distribution and frequency of craters are also considered. The final chapter is devoted to the origin of the Moon's surface. This monograph will be of use to both professional and amateur lunar astronomers.