PRINCIPLES OF THE MECHANICS OF MACHINERY AND ENGINEERING. BY PROFESSOR JULIUS WEISBACH. TRANSLATED AND EDITED BY PROFESSOR GORDON, OF GLASGOW. First American Edition, with Additions, BY PROFESSOR WALTER R. JOHNSON. In two very handsome octavo volumes, of nearly 900 pages, with about 900 superb Illustrations, handsomely and strongly bound in extra cloth, $6 50. These volumes contain an immense amount of practical information necessary to the machinist, architect, and civil engineer; the whole thoroughly brought up to the most advanced state of scientific investigation. The following rapid summary of the contents will show the manner in which the subjects are successively brought forward. These subjects, treated in all their ramifications and practical applications to Machines, Water-powers, Dams, Bridges, Water-wheels, Turbines, Roofs, Walls, Arches, Windmills, Scales, Steam-boilers, Water-engines, &c. &c., present points of primary importance to every one engaged in machine-work of every description, building, or engineering; while the comprehension of the whole is greatly facilitated by the profusion of clear and beautifully executed illustrations which are interspersed throughout the work. THE YOUNG MILLWRIGHT, AND MILLER'S GUIDE. Illustrated by twenty-eight Descriptive Plates. By OLIVER EVANS, with Additions and Corrections by THOMAS P. JONES. With a Description of an Improved Merchant Flour-mill, by C. and O. EVANS. Fourteenth edition. In one handsome octavo volume, strongly bound in leather, $2 50. 80 BLANCHARD AND LEA'S PUBLICATIONS. New and much Improved Edition-(Lately Issued.) PHYSICAL GEOGRAPHY. BY MARY SOMERVILLE. 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Great care has been exercised in both the text and the glossary to obtain the accuracy so essential to a work of this nature, and in its present improved and enlarged state, with no corresponding increase of price, it is confidently presented as in every way worthy a continuance of the striking favor with which it has been everywhere received. From Lieutenant Maury, U. S. N. I thank you for the "Physical Geography;" it is capital. I have been reading it, and like it so much that I have made it a school-book for my children, whom I am teaching. There is, in my opinion, no work upon that interesting subject on which it treatsPhysical Geography-that would make a better textbook in our schools and colleges. I hope it will be adopted as such generally, for you have Americanized it and improved it in other respects. From Samuel H. Taylor, Esq., Philips Academy, We have introduced your edition of Mrs. Somerville's "Physical Geography" into our school, and find it an admirable work. 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