OTHER WORLDS THAN OURS: THE PLURALITY OF WORLDS, STUDIED UNDER THE LIGHT OF RECENT SCIENTIFIC RESEARCHES. By RICHARD ANTHONY PROCTOR. With Illustrations, some colored. 12mo. Cloth, $2.50. LIGHT SCIENCE FOR LEISURE HOURS. A Series of Familiar Essays on Scientific Subjects, Natural Phenomena, etc. By RICHARD ANTHONY PROCTOR. 12mo. Cloth, $1.75. THE MOON: HER MOTIONS, ASPECT, SCENERY, AND PHYSICAL CONDITIONS. With Three Lunar Photographs, and many Plates, Charts, etc. By RICHARD ANTHONY PROCTOR. 8vo. Cloth, $3.50. THE EXPANSE OF HEAVEN. A Series of Essays on the Wonders of the Firmament. By RICHARD ANTHONY PROCTOR. 12mo. Cloth, $2.00. OUR PLACE AMONG INFINITIES. A Series of Essays contrasting our Little Abode in Space and Time with the Infinities around us. To which are added Essays on the Jewish Sabbath and Astrology. By RICHARD ANTHONY PROCTOR. 12mo. Cloth, $1.75. PHYSICAL EXPRESSION: Its Modes and Principles. By FRANCIS WARNER, M. D., Assistant Physician, and Lecturer on Botany, to the London Hospital, etc. With 51 Illustrations. 12mo. Cloth, $1.75. “In the term ‘Physical Expression,’ Dr. Warner included all those changes of form and feature occurring in the body which may be interpreted as evidences of mental action. At first thought it would seem that facial expression is the most important of these outward signs of inner processes; but a little observation will convince one that the posture assumed by the body—the poise of the head and the position of the hands—as well as the many alternations of color and of general nutrition, are just as striking evidences of the course of thought. The subject thus developed by the author becomes quite extensive, and is exceedingly interesting. The work is fully up to the standard maintained in ‘The International Scientific Series.’”—_Science._ “Among those, besides physicians, dentists, and oculists, to whom Dr. Warner’s book will be of benefit are actors and artists. The art of gesticulation and of postures is dealt with clearly from the scientific student’s point of view. In the chapters concerning expression in the head, expression in the face, expression in the eyes, and in that on art criticism, the reader may find many new suggestions.”—_Philadelphia Press._ COMMON SENSE OF THE EXACT SCIENCES. By the late WILLIAM KINGDON CLIFFORD. With 100 Figures. 12mo. Cloth, $1.50.