This periodical was started (in 1872) to promote the diffusion of valuable scientific knowledge, in a readable and attractive form, among all classes of the community, and has thus far met a want supplied by no other magazine in the United States. Containing instructive and interesting articles and abstracts of articles, original, selected, translated, and illustrated, from the pens of the leading scientific men of different countries; accounts of important scientific discoveries, the application of science to the practical arts, and the latest views put forth concerning natural phenomena, have been given by _savants_ of the highest authority. Prominent attention has been also devoted to those various sciences which help to a better understanding of the nature of man, to the bearings of science upon the questions of society and government, to scientific education, and to the conflicts which spring from the progressive nature of scientific knowledge. THE POPULAR SCIENCE MONTHLY is published monthly in a large octavo, handsomely printed on clear type, and, when the subjects admit, fully illustrated. Each number contains 128 pages. TERMS: $5.00 per annum, or Fifty Cents per Number. Postage free to all Subscribers in the United States. THE ART JOURNAL: _An International Gallery of Engravings_, BY DISTINGUISHED ARTISTS OF EUROPE AND AMERICA; WITH ILLUSTRATED PAPERS IN THE VARIOUS BRANCHES OF ART. THE ART JOURNAL is a quarto monthly publication, superbly illustrated and printed, and specially devoted to the world of Art--Painting, Sculpture, Architecture, Decoration, Engraving, Etching, Enameling, and Designing in all its branches--having in view the double purpose of supplying a complete illustrated record of progress in the Arts, and of affording a means for the cultivation of Art-taste among the people. Each number is richly and abundantly illustrated on both steel and wood, and no pains are spared to render this "ART JOURNAL" the most valuable publication of the kind in the world. It contains the Steel Plates and Illustrations of the LONDON ART JOURNAL, a publication of world-wide fame (the exclusive right of which, for Canada and the United States, has been purchased by the publishers); with _extensive additions devoted principally to American Art and American topics_. _Published monthly. Sold only by Subscription._ Price, 75 Cents per Number; $9.00 per Annum, postage prepaid. Subscriptions received by the Publishers, or their Agents. AGENCIES: 22 Hawley St., Boston; 922 Chestnut St., Philadelphia; 22 Post-Office Avenue, Baltimore; 53 Ninth St., Pittsburg; 100 State St., Albany; 42 State St., Rochester; 103 State St, Chicago; 30 W. 4th St., Cincinnati; 305 Locust St., St. Louis; 20 St. Charles St., New Orleans; 230 Sutter St., San Francisco. _D. APPLETON & CO., Publishers, 549 & 551 Broadway, N. Y._ * * * FOOTNOTES: [1] _See_ Demmin, "Guide," etc., p. 130.