The volume comprises upward of twenty essays, among which "The Duty of Praise," "A Plea for the Erring," "Hot-house Education," "The Art of Listening," and "Office-Seeking," are especially noteworthy.
The Bolometer and Radiant Energy. By Professor S. P. Langley. Reprinted from the "Proceedings of the American Academy of Arts and Sciences." Cambridge: University Press. Pp. 16.
The Bolometer. By Professor S. P. Langley, Allegheny Observatory, Pennsylvania. Read before the American Metrological Society, December, 1880. New York: Published by the Society. Pp. 7.
Recognizing that the prism does not give the true values for the heat of the spectrum, and that it displaces the maximum ordinate of the heat-curve, the author has constructed and used a new apparatus—the "Bolometer," or "Actinic Balance," for the purpose of gaining a more actual value of the heat, the description of which and its operation is the chief purpose of these papers. With this instrument he has reached the interesting and unexpected conclusion that "the great proportion of all solar heat received at the earth's surface does not apparently lie in the non-luminous parts of the spectrum. Not only is the heat-maximum in the luminous part, but the total sum of non-luminous heat (so far at least as our measures extend) is relatively small."
Second German Book after the Natural or Pestalozzian Method for Schools and Home Instruction. By James H. Worman, A. M., author of a Series for Modern Languages, etc., and Professor in the Adelphi Academy, Brooklyn, New York. New York and Chicago: A. S. Barnes & Co. Pp. 84. Price, 40 cents.
The plan of the course of which this volume is a part has been developed during the practice of teaching German. Its general features are exclusive use of the German language without the help of the learner's vernacular; attention to grammatical and lexical details; the deduction of the rules from the examples; teaching by contrast and association; and graded lessons made up of conversations on familiar topics, so arranged as to supply a stock of words for daily use in common affairs.
Report on Foreign Life-saving Apparatus. By Lieutenant D. A. Lyle, Ordnance Department, U. S. A. Washington: Government Printing-office. Pp. 48, with Nineteen Plates.
Several lots of foreign life-saving rockets were sent to Sandy Hook, New Jersey, in the spring of 1879, for examination and trial, under the inspection of the author. They were stored for several months under ordinary conditions of exposure, and then inspected and experimented with. The report describes the experiments and the results obtained with the Russian, German, English, and Hooper apparatus.
Geological Survey of Alabama: Report of Progress for 1879 and 1880. By Eugene A. Smith, Ph. D., State Geologist. Montgomery, Alabama: Allred & Beers, State Printers. Pp. 158, with Maps.
The principal feature of the operations was the survey of the Black Warrior River and Warrior Coal Field, from Tuscaloosa to Sipsey Fork, conducted with a view partly to estimate the resources of the country, partly to ascertain the nature and extent of the obstructions to navigation, and the cost of removing or overcoming them. A report, by Henry McCalley, on the counties lying north of the Tennessee River is also included. Particular reports, with analysis, are given of fifty mines or outcrops of coal in the Warrior Field.