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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. J. Symons. Expulsion of Water from a Growing Leaf, Joseph F. James. A Scientific Swindler, F. V. Hayden. 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. 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