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THE POPULAR SCIENCE MONTHLY.

Book of Cats and Dogs and other Friends. By James Johonnot. New York: D. Appleton & Co. Pp. 96 20 cents.

A Compend of Geology. By Joseph Le Conte New York: D. Appleton & Co. Pp. 399. $1.50.

Forestry of the Ural Mountains. Compiled by John Croumbie Brown. Edinburgh: Oliver & Boyd; Montreal: Dawson Brothers. Pp. 182.

Occult Science in India and among the Ancients. By Louis Jacolliot. New York: John W. Lovell & Co. Pp. 275.

Icaria: A Chapter in the History of Communism. By Albert Shaw, Ph.D. New York: G. P. Putnam's Sons. Pp. 219. $l.

My Farm at Edgewood. By the author of "Reveries of a Bachelor." New York: Charles Scribner's Sons. Pp. 339. $1.25.

Country Cousins. By Ernest Ingersoll. New York: Harper & Brothers. Pp. 252.

U. S. Life-Saving Service. Report for 1883. Washington: Government Printing-Office. Pp. 519.

There was once a Man. By R. H. Newell. New York: Fords, Howard & Hulbert. Pp. 520. $1.50.

An Appeal to Cæsar. By Albion W. Tourgee. New York: Fords, Howard & Hulbert. Pp. 422. $1.

Black and White. By T. Thomas Fortune. New York: Fords, Howard & Hulbert. Pp. 310. $1.

The Physician's Visiting List for 1885. Philadelphia: P. Blakiston, Son & Co.

The Northern Sugar Industry during the Season of 1883. By H. W. Wiley. Pp. 120, with 11 Charts. Composition of American Wheat and Corn. Second report by Clifford Richardson. Pp. 98. Washington: Department of Agriculture, Bureau of Chemistry.

Popular Fallacies regarding Precious-Metal Ore-Deposits. By Albert Williams, Jr. Pp. 16.

Comprehensive Anatomy, Physiology, and Hygiene. By John C. Cutter, M.D. Philadelphia: J. B. Lippincott & Co. Pp. 376. $1.

The Eclectic Physiology. By Eli F. Brown, M.D. Cincinnati and New York: Van Antwerp, Bragg &, Co. Pp. 180.

A Thousand Questions on American History. Syracuse, N.Y.: C. W. Bardeen. Pp. 247.

Bread-Making, By T. N. T. New York: G. P. Putnam's Sons. Pp. 64. 50 cents.

The Lock-Jaw of Infants. By J. F. Hartigan, M.D. New York: Bermingham & Co. Pp. 123.

Outlines of Roman Law. By William C. Morey, Ph.D. New York: G. P. Putnam's Sons. Pp. 433. $1.75.

Report of the Commissioner of Education. 1882-'83. Washington: Government Printing-Office. Pp. 872.

Magneto-and Dvnamo-Electric Machines. By Dr. H. Schellen. New York: D. Van Nostrand. Pp. 518.

Our Birds and their Haunts. By the Rev. J. Hibbert Langille. Boston: S. E. Cassino & Co. Pp. 624.

A Migration Legend of the Creek Indians. By Albert S. Gatschet. Vol. I. Philadelphia: D. G. Brinton. Pp. 251.

A System of Psychology. By Daniel Greenleaf Thompson. London: Longmans, Green & Co. Two vols. Pp. 613 and 589. 30s.

The Destiny of Man viewed in the Light of his Origin. By John Fisk. Boston: Houghton, Mifflin & Co. 1884. Pp. 121. $1.

Thomas Carlyle: A History of his Life in London, 1834-1881. By James Anthony Froude. M.A. New York: Charles Scribner's Sons. 1884. Pp. 417. $1.50.

 


POPULAR MISCELLANY.

American Association Addresses.—Professor J. W. Langley's vice-presidential address before the Chemical Section of the American Association was on "Chemical Affinity." lie opened his paper with a review of the various theories that had been proposed to account for chemical action from Hippocrates down, and showed how the term "affinity" has disappeared from the chemical literature of the present day. Three methods of studying the force of affinity have been taken up and followed in parallel courses, which may be designated as the thermal, the electrical, and the method of time or speed. It is deduced from thermo-chemical phenomena that the work of chemical combination is largely influenced by the surrounding conditions of temperature, pressure, and volume, and that the force of affinity is dependent on the conditions exterior to the reacting system which limit the possible amount of change. The electrical method has been followed less actively than the thermal one, and has not led to any particularly definite results. Very little work has been done in the method of time or speed of chemical reaction, in which, however. Professor Langley suggests that the future of chemical research may lie. Chemistry is behind physics, in that it is served by only two fundamental conceptions—mass and volume—while physics is underlain by three—space, mass, time. What would physics be without the notation of velocities? such in a measure is chemistry without taking account of dynamics. Whenever we look outside of chemistry, we find that the lines of the great theories along which progress is making are those of dynamic hypotheses. So it is in biology, in geology, and in physiology, where all observations are made in the light of time-indications; and so it must be in chemistry. "The study of the speed of reaction has but just begun. It is a line of work surrounded with unusual difficulties, but it contains a rich store of promise."

In his address before the Geological and Geographical Section on "The Crystalline Rocks of the Northwest," Professor N. II. Winchell presented some considerations in favor of recognizing and adopting in Ameri-