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THE POPULAR SCIENCE MONTHLY.

Extracts from Chordal's Letters. New York: "American Machinist" Publishing Co. Pp. 320. Price, $1.50.

This is a collection of letters contributed during the past two years to the "American Machinist," and published under the above title. They treat of all sorts of topics connected with the work and management of a machine-shop in a bright, attractive style, and are very interesting reading to others than machinists. To the young mechanic the book is of especial value for its constant insistence upon the necessity of good work if a man would rise, and its scorn of the careless and shiftless workman. The author does not stop to moralize, but this thesis is presented at every turn in the many examples and illustrations of shop-work given, and in a way to enable the dullest reader to see its bearing.

Tide-Tables for the Atlantic Coast of the United States for the Year 1881. The same for the Pacific Coast. Washington: Government Printing-Office. Pp. 129 and 65. Price, 25 cents each.

The tables give for every day of the year the approximate predicted times and heights of the tides at the principal ports on either coast, including fifteen ports on the Atlantic and four ports on the Pacific coast. For intermediate ports, tables of tidal constants are appended, from which the times and heights of the tides may be computed for those places by applying the corrections which are designated to the figures assigned to the principal ports with which they are grouped.

Report on the Marine Isopoda of New England and Adjacent Waters. By Oscar Harger. (From the Report of the United States Commissioner of Fish and Fisheries, 1878.) Paper, pp. 168.

The report includes descriptions of the species of Isopoda which are at present known to inhabit the coast of New England and the adjacent regions, as far as New Jersey on the south and Nova Scotia on the north. Besides the special labors of the Fish Commission, the collections of Professors Verrill and Smith, of Yale College, and others, have been used as aids in the study. The descriptions are full, and nearly all the species are figured in more or less of detail. The family, named from all the legs being thoracic and generally similar, is represented on land by the common "sow-bugs," "hill-bugs," and wood-lice.

A Syllabus of Anglo-Saxon Literature. By J. M. Hart. Adapted from Bernhard Ten Brink's "Geschichte der englischen Litteratur." Cincinnati: Robert Clarke & Co. 1881. Pp. 69.

This work furnishes a history and analysis of Anglo-Saxon literature in its whole field and in the view of its various relations, with commentaries calling attention to its leading characteristics, and pointing out the peculiarities of particular authors and works.

Second Biennial Report of the Superintendent of Public Instruction of the State of Colorado. Denver: Tribune Publishing Company. 1879-1880. Pp. 134.

This pamphlet contains, in addition to the Superintendent's review of his work for two years, a synopsis of the public-school system of Colorado, the reports of the county superintendents and of the University of Colorado, and the addresses delivered at the annual meeting of the State Teachers' Association. Of 35,566 children of school-age in the State, 22,119 were enrolled in the schools, and the average attendance was 12,618. The expenditure per capita of school population was $11.07, and the expenditure per capita of average attendance was $31.38. The university was attended by 121 students. The addresses before the Teachers' Association include one on "Influence," by the President; a criticism of classical education, by Mr. David Boyd; and a plea for the higher education of women, by Mr. F. E. Smith.

Papilio: Devoted to Lepidoptera exclusively. Organ of the New York Entomological Club. New York: Henry Edwards, 185 East 116th Street. January, February, and March numbers. Pp. 12, each. Price, $2.00 for ten numbers.

This magazine is published monthly, except in the two "summer vacation" months. In connection with its special subject it will embrace within the scope of its articles notes on the transformations and diseases of the Lepidoptera, their use and detriment