WARNER. - New Theorems, Tables, and Diagrams, for the Computation of Earth-work:

Designed for the use of Engineers in Preliminary and Final Estimates, of Students in Engineering, and of Contractors and other non-professional Computers. In two parts, with an Appendix. Part I. A Practical Treatise; Part II. A Theoretical Treatise, and the Appendix. Containing Notes to the Rules and Examples of Part I.; Explanations of the Construction of Scales, Tables, and Diagrams, and a Treatise upon Equivalent Square Bases and Equivalent Level Heights. The whole illustrated by numerous original engravings, comprising explanatory cuts for Definitions and Problems, Stereometric Scales and Diagrams, and a series of Lithographic Drawings from Models: Showing all the Combinations of Solid Forms which occur in Railroad Excavations and Embankments. By John Warner, A.M., Mining and Mechanical Engineer. Illustrated by 14 Plates. A new, revised and improved edition. 8vo. $4.00

WATSON. - A Manual of the Hand-Lathe:

Comprising Concise Directions for Working Metals of all kinds, Ivory, Bone and Precious Woods; Dyeing, Coloring, and French Polishing; Inlaying by Veneers, and various methods practised to produce Elaborate work with Dispatch, and at Small Expense. By Egbert P. Watson, Author of "The Modern Practice of American Machinists and Engineers." Illustrated by 78 engravings. $1.50

WATSON. - The Modern Practice of American Machinists and Engineers:

Including the Construction, Application, and Use of Drills, Lathe Tools, Cutters for Boring Cylinders, and Hollow-work generally, with the most Economical Speed for the same; the Results verified by Actual Practice at the Lathe, the Vise, and on the Floor. Together with Workshop Management, Economy of Manufacture, the Steam-Engine, Boilers, Gears, Belting, etc., etc. By Egbert P. Watson. Illustrated by eighty-six engravings. 12mo. $2.50

WATSON. - The Theory and Practice of the Art of Weaving by Hand and Power:

With Calculations and Tables for the Use of those connected with the Trade. By John Watson, Manufacturer and Practical Machine-Maker. Illustrated by large Drawings of the best Power Looms. 8vo. $7.50

WATT. - The Art of Soap Making:

A Practical Hand-book of the Manufacture of Hard and Soft Soaps, Toilet Soaps, etc., including many New Processes, and a Chapter on the Recovery of Glycerine from Waste Leys. By Alexander Watt. Ill. 12mo. $3.00

WEATHERLY. - Treatise on the Art of Boiling Sugar, Crystallizing, Lozenge-making, Comfits, Gum Goods,

And other processes for Confectionery, etc., in which are explained, in an easy and familiar manner, the various Methods of Manufacturing every Description of Raw and Refined Sugar Goods, as sold by Confectioners and others. 12mo. $1.50

WEDDING. - Elements of the Metallurgy of Iron.

By Dr. Hermann Wedding, Royal Privy Counsellor of Mines, Berlin, Prussia. Translated from the second revised and rewritten German edition. By William T. Brannt, Graduate of the Royal Agricultural College at Eldena, Prussia. Edited by William H. Wahl, Ph. D., Secretary of the Franklin Institute, Philadelphia. Illustrated by about 250 engravings. 8vo., about 500 pages (In preparation.)

WEINHOLD. - Introduction to Experimental Physics, Theoretical and Practical.

Including directions for Constructing Physical Apparatus and for Making Experiments. By Adolf F. Weinhold, Professor in the Royal Technical School at Chemnitz. Translated and edited, with the author's sanction, by Benjamin Loewy, F.R.A.S., with a preface, by G.C. Foster, F.R.S. Illustrated by three colored plates and 404 wood-cuts. 8vo., 848 pages $6.00

WIGHTWICK. - Hints to Young Architects:

Comprising Advice to those who, while yet at school, are destined to the Profession; to such as, having passed their pupilage, are about to travel; and to those who, having completed their education, are about to practise. Together with a Model Specification involving a great variety of instructive and suggestive matter. By George Wightwick, Architect. A new edition, revised and considerably enlarged; comprising Treatises on the Principles of Construction and Design. By G. Huskisson Guillaume, Architect. Numerous Illustrations. One vol. 12mo. $2.00

WILL. - Tables of Qualitative Chemical Analysis.

With an Introductory Chapter on the Course of Analysis. By Professor Heinrich Will, of Giessen, Germany. Third American, from the eleventh German edition. Edited by Charles F. Himes. Ph. D., Professor of Natural Science, Dickinson College, Carlisle, Pa. 8vo. $1.50

WILLIAMS. - On Heat and Steam:

Embracing New Views of Vaporization, Condensation, and Explosion. By Charles Wye Williams, A.I.C.E. Illustrated 8vo. $3.50

WILSON. - A Treatise on Steam Boilers:

Their Strength, Construction, and Economical Working. By Robert Wilson. Illustrated 12mo. $2.50

WILSON. - Cotton Carder's Companion:

In which is given a description of the manner of Picking, Baling, Marketing, Opening, and Carding Cotton; to which is added a list of valuable Tables, Rules, and Receipts, by Foster Wilson. 12mo. $1.50

WILSON. - First Principles of Political Economy:

With Reference to Statesmanship and the Progress of Civilization. By Professor W.D. Wilson, of the Cornell University. A new and revised edition. 12mo. $1.50

WÖHLER. - A Hand-book of Mineral Analysis.

By F. Wöhler, Professor of Chemistry in the University of Göttingen. Edited by Henry B. Nason, Professor of Chemistry in the Renssalaer Polytechnic Institute, Troy, New York. Illustrated 12mo. $3.00

WORSSAM. - On Mechanical Saws:

From the Transactions of the Society of Engineers, 1869. By S.W. Worssam, Jr. Illustrated by eighteen large plates. 8vo. $2.50

Recent Additions

ANDERSON - The Prospector's Hand-Book:

A Guide for the Prospector and Traveler in Search of Metal Bearing or other Valuable Minerals. By J.W. Anderson. 52 Illustrations. 12mo. $1.50