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THE POPULAR SCIENCE MONTHLY.

Horses: their Feed and their Feet. By C. E. Page, M. D. New York: Fowler & Wells. Pp. 150. 50 cents.

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Prison Labor. Some Considerations in Favor of maintaining the Present System. By John S. Perry. Albany: Weed, Parsons & Co. Pp. 128.

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The Mounds of the Mississippi Valley Historically Considered. By Lucien Carr, Cambridge, Mass. Pp. 107.

Transactions of the Medical and Chirurgical Faculty of the State of Maryland, April, 1883. Baltimore: Isaac Friedenwald. Pp. 802.

Aperçu sur la Théorie de l'Evolution (Summary of the Theory of Evolution). By Dr. Ladislao Netto. Rio de Janeiro: Le Messager du Bresil. Pp. 22.

Questões Hygienicas (Hygienic Questions): Animal Mephitism. The Sewers of Rio de Janeiro and their Influence on the Public Health. Some Hygienic Counsels to the People. By Dr. Joao Pires Farinha. Rio de Janeiro: Typographia Nacional. Pp. 54.

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Ancient Egypt in the Light of Modern Discoveries. By Professor H. S. Osborn, LL.D. Cincinnati: Robert Clarke & Co. Pp. 232. $1.25.

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Sea-Sickness: Its Cause, Nature, and Prevention. By William H. Hudson. Boston: S. E. Cassino & Co. Pp. 147. $1.25.

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Animal Life. By E. Perceval Wright, M.A., M.D. London, Paris, and New York: Cassell, Petter, Galpin & Co. Pp. 618. $2.50. Illustrated.

Bulletin of the United States Fish Commission. Vol. i, 1881, pp. 466; vol. ii, 1882, pp. 467. Washington: Government Printing-Office.

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Mineral Resources of the United States. By Albert Williams, Jr. Washington: Government Printing-Office. Pp. 813.

The Law of Heredity. A Study of the Cause of Variation and the Origin of Living Organisms. By W. K. Brooks, Associate in Biology, Johns Hopkins University. Baltimore: John Murphy & Co. 1883. Pp. 836.

Cumulative Method for Learning German. By Adolph Dreyspring. New York: D. Appleton & Co. Pp. 253. $1.50.

 


POPULAR MISCELLANY.

Glacial Theories at the American Association.—Topics connected with the glacial theory received much discussion at the Minneapolis meeting of the American Association. In his paper on "The Life History of the Niagara River," Mr. Julius Pohlman held that the falls had no part in excavating the gorge below the whirlpool; but that, Lake Ontario subsiding slowly, no waterfall was formed at its entrance, and the lower part of the gorge was worn out by the river as a rapid in an old shallow valley, till at the whirlpool this path met the ancient river-valley, while it was along that valley only that the falls receded to their present site. In a paper on "Glacial Cañons," W. J. McGee, of Salt Lake City, suggested that the formation of the cañons could be accounted for by presuming that typical water-cut canons were temporarily occupied by glacial ice, which would convert them from a V into a U shape, and that their features do not "necessarily imply extensive glacial excavation, or indicate that glaciers are superlatively energetic engines of erosion." In his paper on the extent, character, and teachings of the ancient glaciation of North America, Professor Newberry maintained that—1. Glaciers covered most of the elevated portions of the mountain-belts in the far West as far south as the thirty-sixth parallel, and in the eastern half of the continent to the fortieth parallel of latitude. 2. The ancient glaciers, which occupied the area above described, were not produced by local causes, but were evidences of a general climatic condition. 3. They could not have been the effect of a warm climate and an abundant precipitation of moisture, but were results of a general depression of temperature. Having stated his objections to the iceberg theory, Professor Newberry added that "the record of the ice period on our continent is far more impressive and extensive than it has been represented. The phenomena were due to an extraneous and