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Nature volume 63, pages 505506 (21 March 1901) | Download Citation



American Journal of Science, March.—Circular magnetisation and magnetic permeability, by John Trowbridge and E. P. Adams. The experiments of Klemenčič upon the intensity of magnetisation produced by an oscillatory current in an iron wire, showed that for a frequency of 9 × 107 oscillations per second; the permeability of iron to oscillatory currents is a constant. In the present paper the oscillation frequencies are much lower, ranging from 600 to 3000, and in this case the permeability is not a constant, but depends upon the strength of the magnetic field; that is, the iron behaves towards oscillatory currents in much the same manner as it does towards steady currents.—Notes on the geology of parts of the Seminole, Greek, Cherokee, and Osage nations, by C. N. Gould. A line of coal beds extends north and south near Bartlesville, Skiatook, Dawson, Tulsa, Okmulgee, and Henryville. There is no reason to doubt that gas and oil will eventually be found, near these coal beds.—Names for the formations of the Ohio coal measures, by C. S. Prossner. —A new American species of Amphicyon, by J. L. Wortman. A description of a palatal portion of a skull from the Loup Fork Miocene deposits of Nebraska, named Amphicyon americanus, which is undoubtedly to be referred to the European genus. All the Amphicyons of the American Tertiary hitherto described belong to genera quite different and distinct from the typical genus Amphicyon of Europe.—Studies in the Cyperaceæ, by T. Holm. Carices (Vigneae) astrostachyae.—A just intonation piano, by S. A. Hageman. A description of a piano mechanism for giving just intonation as opposed to equal temperament.—Very on atmospheric radiation, by W. Hallock.

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