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A HANDYBOOK FOR THE CALCULATION OF STRAINS IN GIRDERS AND SIMILAR STRUCTURES, AND THEIR STRENGTH. Consisting of Formulae and Corresponding Diagrams, with numerous Details for Practical Application, etc., etc. By William Humber, Assoc. Inst., C. E., author of " A Practical Treatise on Cast and Wrought-Iron Bridge Construction," etc., etc. New York : t. Van Nostrand, Publisher, Nos. 23 Murray and 27 Warren streets. The scope of this work is to give, in a concise and convenient form, formulae for bridge and girder calculations, without giving more than is abso-utely necessary for the complete solution of practical problems. A prominent feature of the work is the extensive application of simple diagrams to such calculations, involving only the use of the parabola and right lines. The work is a small octavo, and very conveniently arranged for reference, with numerous illustrations of joints for timber and iron structures, various sections of girders, etc., etc. We have not found time to examine minutely the various formulae given, but the work is undoubtedly a valuable publication. TRANSATIONS OF THE WISCONSON STATE AGRICULTURAL SOCIETY. With the Report of the State Horticultural Society and Condensed Reports on the International Exhibitions of 1862 and 1867. Vol. VII., from 1861 to 1868, inclusive. Prepared by J. W. Hoyt, Secretary. We are in receipt of the above volume by the courtesy of Secretary Hoyt, and find therein much interesting matter, some extracts from which we will, in good time, lay before our readers. PRIMEVAL MAN. An Examination of some Recent Speculations. By the Duke of Argyll. George Routledge& Sons, No. 416 Broome street, New York city. The author of this work is doubtless one of the ablest thinkers in Europe, and he has already given practical evidence of his ability in book making by the publication of a work on " The Reign of Law," which has received the commendation of the English press. The present work discusses the origin and antiquity of man and his primeval condition, reviewing the opinion of Sir J. Lubbock upon " The Early condition of Mankind," and Archbishop Whatley's" Origin of Civilization." It therefore has to deal with questions which touch upon the prof oundest problems ofour nature and of our history, and is altogether a very interesting and instructive work, one that all may read with profit. Price, $1*50. WE have received from thcAmerican Mre Works, Boston, Mass., a very neat specimen of advertising in the shape of a pocket-book, containing mechanical tables of value and other statistical matter, and entitled Pocket Companion for Mechanics, Machinists, and Engineers." It is bound in morocco, with pockets forbills and papers, and is a very neat and useful article.
