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value of problems as means for securing accuracy in a knowledge of the subject, and as tests for attainments, is generally recognized by the best educators. The present work was prepared to meet a need felt by the author, who is a professor in Lawrence University, Wisconsin, in instructing his classes. Its plan is very simple. After defining the terms used, and briefly stating the principle to be illustrated, a typical problem is solved, and from the solution a formula of general application is deduced, which is followed by problems to be worked by the student. These, as a rule, bear upon the fundamental principles of chemistry.

some application of electricity is devised to supersede it, steam is, in all probability, destined to be the agent by which our houses will be heated in the future. Aside from its superior cleanliness as compared with most other methods of heating apartments, the facility with which the warming and ventilation are managed, when it is once established, is a strong recommendation in its favor. Mr. Briggs's treatise includes a great deal that the builder and householder will find useful on the subject, particularly on the practical side.

Proceeding of the Boston Society of Natural History. Vol. XXII. November, 1882, to February, 1883. Pp. 112, with Six Plates.

Summary of Progress in Mineralogy in 1883. By H. Carvill Lewis, Philadelphia. Pp. 50.

What shall we do for the Drunkard? By Orpheus Everts, M. D. Cincinnati: Robert Clarke & Co. Pp. 56.

Insects injurious to Vegetation and how to get rid of Them. By Dr. C. A. Greene, of Harrisburg, Pa. Pp. 9.

A Brief Statement of the Doctrines and Philosophy of the Social Labor Movement. By A. J. Starkweather and S. Robert Nilson. San Francisco: S. F. Truth Publishing Company. Pp. 62. 15 cents.

Shall we put Spectacles on Children? By Julian J. Chisholm, M. D., University of Maryland. Pp. 6.

Count Rumford, Originator of the Royal Institution. By Professor Tyndall. London. Pp. 48.

The Batrachia of the Permian Period of North America. By E. D. Cope. Pp. 14.

Paleontological Bulletin. No. 37. Various papers by E. D. Cope. Philadelphia: A. E. Foote, 1223 Belmont Avenue. Pp. 20.

The Evidence for Evolution in the History of the Extinct Mammalia. By E. D. Cope, of Philadelphia. Salem: Salem Press. Pp. 19.

Micrometry, Report of the National Committee, etc. R. H. Ward, Secretary. Troy, N. Y. Pp. 23.

The Bufalini Prize, U. S. Bureau of Education. Washington: Government Printing-Office. Pp. 5.

Development of a Dandelion-Flower. By John M. Coulter. Pp. 7.

The Seasons in Iowa, and a Calendar for 1884. By Gustavus Hinrichs. Iowa City, Iowa. Pp. 24.

Illinois. By William Hosea Ballou. Pp. 6.

Official Register of Dentists in Iowa. Iowa City: A. O. Hunt, D. D. S. Pp. 34.

Pilot Chart of the North Atlantic for January, with a Supplement (pp. 2) giving Position and Detail of Floating Wrecks. By Commander J. R. Bartlett, U. S. Hydrographic Office.

Injurious Garden Insects. By Byron D. Halstead, Sc. D. New York: Phillips & Hunt. Pp. 16. 5 cents.

The Zone of Asteroids and the Ring of Saturn. By Professor Daniel Kirkwood, Bloomington, Indiana. Pp. 4.

People and Places. By Sarah K. Bolton. Cleveland Educational Bureau, Cleveland, Ohio. Pp. 40.

American Society of Microscopists. Proceedings of the Sixth Annual Meeting, August, 1888. Buffalo: Haas & Klein. Pp. 279. $1.30.

Contributions from the Chemical Laboratory of the University of Michigan. Edited by Albert B. Prescott and Victor C. Vaughan. Vol. I, Part IL Ann Arbor, Mich. Pp. 48. 40 cents.

Transactions of the New York Academy of Sciences. "Contents" and "Index" of Vol. 1 and eight numbers of Vol. II. Pp. 170.

Morphology, Estimates of Intelligence, Vital Chemistry. By Frank B. Scott. Badax, Mich. Pp. 16.

Physical Studies of Lake Tahoe. By Professor John Le Conte. Pp. 37.

Hysteria. By James Hendrie Lloyd, A. M., M. D. Philadelphia. Pp. 21.

Downward Displacement of the Transverse Colon. By Charles Hermon Thomas, M. D. Philadelphia. Pp. 4.

Of Work and Wealth: A Summary of Economics. By R. R. Bowker. New York: Society for Political Education. Pp. 48. 25 cents.

Medical Symbolism. By T. S. Sozinskey, M. D. Philadelphia. Pp. 11.

The Ellipticon. By J. L. Naish. New York. Pp. 2. $1.

New York Post-Graduate Medical School, New York City. Sessions of 1883-'84. Pp. 16.

The Termination of the Nerves in the Kidney. By M. L. Holbrook, M. D. New York City. Pp. 8.

Annual Report of the Hydrographer of the Navy Department. 1883. Washington: Government Printing-Office. Pp. 15.

Report of the Commission to select and locate Parks in New York City. New York: M. H. Brown, 49 Park Place. Pp. 215, with Plates.

Federal Taxation: The Urgent Necessity of Reform. By Samuel Barnett. Atlanta, Ga. Pp. 45.

Prison Contract Labor: Analysis of the Vote (New York). Albany: Weed, Parsons & Co. Pp. 22.

Astronomical Observatory of Harvard College. Thirty-eighth Annual Report. By Edward C. Pickering. Cambridge: John Wilson & Son. Pp. 17.

Bureau of Statistics, Treasury Department. Quarterly Report to September 30, 1883. Washington: Government Printing-Office. Pp. 133.