_LIGHT SCIENCE FOR LEISURE HOURS._ A Series of Familiar Essays on Scientific Subjects, Natural Phenomena, etc. 121110. Cloth, $1.75. D. APPLETON & CO., 72 Fifth Avenue, New York. * * * * * D. APPLETON & CO.'S PUBLICATIONS. _ASTRONOMY WITH AN OPERA-GLASS._ A Popular Introduction to the Study of the Starry Heavens with the Simplest of Optical Instruments. By Garrett P. Serviss. 8vo. Cloth, $1.50. This is a unique book, quite alone in the field that it occupies. The call for a fourth edition within two years after its first publication attests its popularity. As one of its reviewers has said, "It is the most human book on the subject of the stars." It would have supplied Thomas Carlyle's want when he wrote, "Why did not somebody teach me the stars and make me at home in the starry heavens?" Interest in the geography of the heavens is increasing every year, as the discoveries of astronomers with the giant telescopes of our day push back the limits of the known universe, and this book is to those who read of such discoveries like an atlas to the student of history. Some of the compliments that the book has received are these: "A most interesting and even fascinating book."--_Christian Union_. "The glimpses he allows to be seen of far-stretching vistas opening out on every side of his modest course of observation help to fix the attention of the negligent, and lighten the toil of the painstaking student.... Mr. Serviss writes with freshness and vivacity."--_London Saturday Review_. "We are glad to welcome this, the second edition, of a 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_. "Mr. Garrett P. Serviss's book, 'Astronomy with an Opera-Glass,' offers us an admirable hand-book and guide in the cultivation of this noble æsthetic discipline (the study of the stars)."--_New York Home Journal_. "The book should belong to every family library."--_Boston Home Journal_. "This book ought to make star-gazing popular."--_New York Herald_. "The author attributes much of the indifference of otherwise well-informed persons regarding the wonders of the starry firmament to the fact that telescopes are available to few, and that most people have no idea of the possibilities of the more familiar instrument of almost daily use whose powers he sets forth."--New Orleans Times-Democrat. "By its aid thousands of people who have resigned themselves to the ignorance in which they were left at school, by our wretched system of teaching by the book only, will thank Mr. Serviss for the suggestions he has so well carried out."--_New York Times_.