PERIODICALS. THE POPULAR SCIENCE MONTHLY. CONDUCTED BY E. L. AND W. 7. YOUMANS. THE POPULAR SCIENCE MONTHLY was established a dozen years ago to bring before the general public the results of scientific thought on many large and important questions which could find no expression in the current periodicals. Scientific inquiry was penetrating many new fields, extending important knowledge, and profoundly affecting opinion upon numberless questions of speculative and practical interest. It was the policy of this magazine at the outset, and has been constantly adhered to since, to obtain the ablest statements from the most distinguished scientific men of all countries in their bearing upon the higher problems of investigation. 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Those, therefore, who desire to know what is going on in the world of thought in these stirring times, when new knowledge is rapidly extending, and old errors are giving way, will find that they can keep informed only by subscribing for THE POPULAR SCIENCE MONTHLY. TERMS: $5.00 per annum. Volume XXIV. begins with the November number. Subscriptions may begin at any time. New York: D. APPLETON & CO., Publishers, 1, 3 and 5 Bond Street. ~PERIODICALS. A TRIAL SUBSCRIPTION THREE MONTHS, thirteen NUMBERS, $1.00. SCIENCE: An Illustrated Weekly Journal for all Readers Interested in the Progress of Science. In so comprehensive a journal as SCIENCE record and discussion of current scientific news and topics necessarily become, in order to be acceptable to the whole body of scientific men, THE BEST POPULAR SCIENCE FOR ALL INTELLIGENT READERS. As a specimen of the contents of the journal we append the Tables of Contents of three weeks' issues: VOLUME III. No. 56. FEBRUARY 29, 1884. An International Scientific Association. The Alaska Military Reconnoissance of 1883, F. Schwatka. Note on the Flora of the Upper Yukon, Sereno Watson. The Intelligence of Snakes, C. C. Abbott. Presentation of the Rumford Medals to Professor Rowland. Progress of Electrical Science during 1883. John Trowbridge. Biographies of Naturalists. Gordon's Electricity and Magnetism. Bassler's Weather. Art Catalogue of the New England Manufacturers' Institute. Yarrow's Check-List of American Reptiles, Intelligence from Scientific Stations.-United States Geological Survey. Reports of Society Meetings.-Franklin Institute, Philadelphia. Canadian Institute, Toronto. Princeton Science Club. Society of Arts, Boston. Academy of Natural Sciences, Philadelphia. Notes and News. Letters to the Editor.-A Clock for Sending Out Electric Signals Once an Hour or Oftener, H. W. Pennock, Deafness in White Cats, Alexander G. Bell; Benj. Miller. The Krakatoa Eruption, G. 7. Symons. Expulsion of Water from a Growing Leaf, Joseph F. James. A Scientific Swindler, F. V. Hayden. No. 57. MARCH 7, 1884. Gouverneur Kemble Warren, The New Bogosloff Volcano in Bering Sea, George Davidson. The Danish Expedition to East Greenland. Humidity and Chronometer Rates. The Great Comet of 1882. The Work of the Cambridge Archeological Museum. Vortex Rings. The Silk Industry in the United States. Scribner's Where Did Life Begin? Intelligence from Scientific Stations.-United States Geological Survey. Reports of Society Meetings.-Chemical Society, Washington, Biological Society, Washington. Linnaean Society, New York. Letters to the Editor.-Arrow-points at Evanston, Ill., W. A. Phillips. Illusive Memory, Henry F. Osborn. Ripple-marks in No. 58. MARCH 14, 1884. The International Bureau of Weights and Measures, H. W. Blair. A Question of Exposure, 7. C. Mendenhall. Iron from North Carolina Mounds, Cyrus Thomas. Pennsylvania Anthracite, Charles A. Ashburner. Improvements in Testing Machines, A. V. Abbott. New Method of Mounting Reflectors, Simon Newcomb. After-Images, Josiah Royce. Lakes of the Great Basin, Israel C. Russell. The definition of Mean Solar Time. Morphology of the Pelvis and Leg, C. S. Minot, Recent Work on Brachiopods, W. H. Dall. The American Institute of Mining Engineers. Geology of the Grand Cañon. The Bacillus of Beriberi, Biological Theories of an Artist. The Illinois Geological Report. Intelligence from Scientific Stations.-U. S. Geological Survey. Reports of Society Meetings.-Academy of Natural Sciences, Philadelpia. Philosophical Society, Washington. Ottawa Field Letters to the Editor.-Red Sunsets and Precipitation, W. H. Howard. Does Unio Spin a Byssus, E. P. Larkin. Retrogade Meta- Address PUBLISHER OF SCIENCE, 4 Bond St., New York City. THE SCIENCE COMPANY, Owners. OFFICERS AND Directors.-D. C. GILMAN, of Baltimore, President; GARDINER G. HUBBARD, of Washington; ALEX. 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