Abstract
American Journal of Science and Art, November.—The original articles in this number are:-On the variation in the strength of a muscle, by F. E. Nipher.—Studies on magnetic distribution, by H. A. Rowland. This, Part I., is on linear distribution, and the scope is indicated by the titles of the sections: 1. Preliminary Remarks; 2. Mathematical Theory; 3. Experimental Methods for Linear Distribution; 4. Iron Rods magnetised by induction; 5. Straight Electro-magnets and permanent Steel Magnets; 6. Miscellaneous Applications.—Œstivation and its terminology, by Asa Gray.—A note in relation to the mass of meteoric iron that fell in Dickson County, Tenn., 1835, by J. L. Smith.—Specific gravity balance, by Roswell Parish. The object of this is to determine the specific gravities of minerals, and other solids heavier than water, without the use of exact weights and without mathematical computation.—A paper on Southern New England, by Prof. Dana.—Iowa county meteor and its meteorites, by N. R. Leonard.—On the post-Pliocene fossils of Sankoty Head, Nantuck Island, by A. E. Verrill. This article, referring to the paper by Desor and Cabot (Geol. Soc. Lond., 1849), purports to correct some matters of detail in that paper, and raises the number of known species from seventeen to sixty, of which a list is given.—In the short articles under “Scientific Intelligence” are:— Arithmetical relations between the atomic weights; Evidence of glacial action on the summit of Mount Washington; Discovery of the horns of an extinct species of ox in Ohio.—The two following reports are noticed: On the geology and resources of the region in the vicinity of the 49th parallel from the Lake of the Woods to the Rocky Mountains; A reconnaissance of the Black Hills of Dakota made in the summer of 1874.—In an appendix Prof. O. C. Marsh contributes a paper on the Odontornithes, or birds with teeth. After recapitulating facts he has already contributed, he gives this classification:— Sub-class, ODONTORNITHES: A. Teeth in sockets; vertebræ biconcave; sternum with keel; wings well developed; order, Ichthyornithes. B. Teeth in grooves; vertebræ as in recent birds; sternum without keel; wings rudimentary; order, Udontolcæ. There are two plates in illustration of this paper.
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