Their Nature, Possibilities, and Habitability in the Light of the Latest Discoveries. Illustrated. 12mo. Cloth, $1.20 net; postage, 11 cents additional. This book presents the very latest conclusions in regard to the nature and the habitability of the other planets. It is written in popular style, and, at the same time, is scientifically accurate in its statements. It is a convenient handbook of information concerning the solar system, but by no means a dry, scientific treatise on the subject. It might be said to resemble Proctor’s celebrated “Other Worlds than Ours” brought up to date. The last chapter, on “How to Find the Planets,” is unique and should prove very useful. =Pleasures of the Telescope.= A Descriptive Guide for Amateur Astronomers and all Lovers of the Stars. Illustrated with charts of the heavens and with drawings of the planets and charts of the moon. 8vo. Cloth, $1.50. “This is a book which will give intense pleasure to everyone who uses it and follows its clear instructions.”—_Louisville Courier-Journal._ “Every person of culture should possess at least a passing acquaintance with the planets, stars, and constellations. With a little patience and comparatively small effort Mr. Serviss’s new book will enable anyone to obtain this knowledge.”—_Los Angeles Herald._ =Astronomy with an Opera-Glass.= A Popular Introduction to the Study of the Starry Heavens with the Simplest of Optical Instruments. 8vo. Cloth, $1.50. “We are glad to welcome this popular introduction to the study of the heavens.... There could hardly be a more pleasant road to astronomical knowledge than it affords.... A child may understand the text, which reads more like a collection of anecdotes than anything else, but this does not mar its scientific value.”—_Nature._ D. APPLETON AND COMPANY, NEW YORK. ------------------------------------------------------------------------ =BOOKS ON ASTRONOMY.= =Popular Astronomy.= A General Description of the Heavens. By CAMILLE FLAMMARION. Translated from the French by J. Ellard Gore, F.R.A.S. New Revised Edition. With 3 Plates and 288 Illustrations. 8vo. Cloth, $4.50. The author is the most popular scientific writer in France, and the present work was considered of such merit that the Montyon Prize of the French Academy was awarded to it. The subject is treated in a very popular style, and the work is at the same time interesting and reliable. The work has been newly revised throughout and an appendix added, showing all the important advances made in astronomy up to the year 1907. =The Earth’s Beginning.=