The above excellent works of Professor Johnston are being rapidly introduced into both Public Schools and Private Seminaries throughout the country. SMITH'S MATHEMATICAL SERIES, American Statistical Arithmetic, Designed for Academies and Schools. By _Francis H. Smith, A.M._, Superintendent and Professor of Mathematics in the Virginia Military Institute; late Professor of Mathematics in Hampden-Sydney College and formerly Assistant Professor in the United States' Military Academy, West Point, and _R. T. W. Duke_, Assistant Professor of Mathematics in Virginia Military Institute. Third edition. Price, 38 cents. Introduction to Smith and Duke's Arithmetic. By _Francis H. Smith, A.M._ Price 20 cents. Key to Smith and Duke's American Statistical Arithmetic. Prepared by _William Forbes_, Assistant Professor of Mathematics in the Virginia Military Institute. Price, 33 cts. Smith's Elementary Algebra. Price, 56 cents. Smith's Algebra. Price, 88 cents. Smith's Biot. An Elementary Treatise on Analytical Geometry. Translated from the French of J. B. Biot. By _Francis H. Smith, A.M._ Revised edition. Price, $1 25. Mitchell's Ancient Geography. An Ancient, Classical and Sacred Geography; embellished with Engravings of Remarkable Events, Views of Ancient Cities, and various interesting Antique Remains; and illustrated by an Ancient Atlas. By _S. Augustus Mitchell_. Price, $1 25 cts. A good system of Ancient Geography, in the English language, drawn from authentic sources, with cuts illustrative of Ancient customs, places, temples, and other buildings and remarkable events, accompanied with a complete set of Maps of the World as known to the ancients; Asia Minor, Greece, Italy, the Roman Empire; the world as known to the Israelites, a Map of Canaan, with part of Egypt, and the route of the Israelites through the Desert; plans of Ancient Rome, Jerusalem, &c., was very much wanted by teachers of Sabbath Schools, and the members of Bible Classes; and such a one, so far as we are able to judge, we are happy to say, is now presented to the public in a very attractive form. The cuts in the Geography are exceedingly well done, and the Maps in the Atlas are equally well engraved, and equally well printed.--_New York Christian Advocate._ Mitchell's Biblical and Sabbath School Geography.