Economic and Social. By Dr. William Elder. 8vo. $3.00

ELDER. - Memoir of Henry C. Carey.

By Dr. William Elder. 8vo. cloth. $.75

ERNI. - Mineralogy Simplified.

Easy Methods of Determining and Classifying Minerals, including Ores, by means of the Blowpipe, and by Humid Chemical Analysis, based on Professor von Kobell's Tables for the Determination of Minerals, with an Introduction to Modern Chemistry. By Henry Erni, A.M., M.D., Professor of Chemistry. Second Edition, rewritten, enlarged and improved. 12mo. $3.00

FAIRBAIRN. - The Principles of Mechanism and Machinery of Transmission

Comprising the Principles of Mechanism, Wheels, and Pulleys, Strength and Proportions of Shafts, Coupling of Shafts, and Engaging and Disengaging Gear. By Sir William Fairbairn, Bait. C.E. Beautifully illustrated by over 150 wood-cuts. In one volume, 12mo. $2.50

FITCH. - Bessemer Steel,

Ores and Methods, New Facts and Statistics Relating to the Types of Machinery in Use, the Methods in Vogue, Cost and Class of Labor employed, and the Character and Availability of the Ores utilized in the Manufacture of Bessemer Steel in Europe and in the United States; together with opinions and excerpts from various accepted authorities. Compiled and arranged by Thomas W. Fitch. 8vo. $3.00

FLEMING. - Narrow Gauge Railways in America.

A Sketch of their Rise, Progress, and Success. Valuable Statistics as to Grades, Curves, Weight of Rail, Locomotives, Cars, etc. By Howard Fleming. Illustrated, 8vo. $1.50

FORSYTH. - Book of Designs for Headstones, Mural, and other Monuments:

Containing 78 Designs. By James Forsyth. With an Introduction by Charles Boutell, M.A. 4 to., cloth $5.00

FRANKEL - HUTTER. - A Practical Treatise on the Manufacture of Starch, Glucose, Starch-Sugar, and Dextrine:

Based on the German of Ladislaus Von Wagner, Professor in the Royal Technical High School, Buda-Pest, Hungary, and other authorities. By Julius Frankel, Graduate of the Polytechnic School of Hanover. Edited by Robert Hutter, Chemist, Practical Manufacturer of Starch-Sugar. Illustrated by 58 engravings, covering every branch of the subject, including examples of the most Recent and Best American Machinery. 8vo., 344 pp. $3.50

GEE. - The Goldsmith's Handbook:

Containing full instructions for the Alloying and Working of Gold, including the Art of Alloying, Melting, Reducing, Coloring, Collecting, and Refining; the Processes of Manipulation, Recovery of Waste; Chemical and Physical Properties of Gold; with a New System of Mixing its Alloys; Solders, Enamels, and other Useful Rules and Recipes. By George E. Gee. 12mo. $1.75

GEE. - The Silversmith's Handbook:

Containing full instructions for the Alloying and Working of Silver, including the different modes of Refining and Melting the Metal; its Solders; the Preparation of Imitation Alloys; Methods of Manipulation; Prevention of Waste; Instructions for Improving and Finishing the Surface of the Work; together with other Useful Information and Memoranda. By George E. Gee, Jeweller. Illustrated. 12mo. $1.75

GOTHIC ALBUM FOR CABINET-MAKERS:

Designs for Gothic Furniture. Twenty-three plates. Oblong $2.00

GREENWOOD. - Steel and Iron:

Comprising the Practice and Theory of the Several Methods Pursued in their Manufacture, and of their Treatment in the Rolling-Mills, the Forge, and the Foundry. By William Henry Greenwood, F.C.S. Asso. M.I.C.E., M.I.M.E., Associate of the Royal School of Mines. With 97 Diagrams, 536 pages. 12mo. $2.00

GREGORY. - Mathematics for Practical Men:

Adapted to the Pursuits of Surveyors, Architects, Mechanics, and Civil Engineers. By Olinthus Gregory. 8vo., plates. $3.00

GRIER. - Rural Hydraulics:

A Practical Treatise on Rural Household Water Supply. Giving a full description of Springs and Wells, of Pumps and Hydraulic Ram, with Instructions in Cistern Building, Laying of Pipes, etc. By W. W. Grier. Illustrated 8vo. $.75

GRIMSHAW. - Modern Milling:

Being the substance of two addresses delivered by request, at the Franklin Institute, Philadelphia, January 19th; and January 27th, 1881. By Robert Grimshaw, Ph. D. Edited from the Phonographic Reports. With 28 Illustrations. 8vo. $1.00

GRIMSHAW. - Saws:

The History, Development, Action, Classification, and Comparison of Saws of all kinds. With Copious Appendices. Giving the details of Manufacture, Filing. Setting, Gumming, etc. Care and Use of Saws; Tables of Gauges; Capacities of Saw-Mills; List of Saw-Patents, and other valuable information. By Robert Grimshaw. Second and greatly enlarged edition, with Supplement, and 354 Illustrations. Quarto $4.00

GRIMSHAW. - A Supplement to Grimshaw on Saws:

Containing additional practical matter, more especially relating to the Forms of Saw-Teeth, for special material and conditions, and to the Behavior of Saws under particular conditions. 120 Illustrations. By Robert Grimshaw. Quarto. $2.00

GRISWOLD. - Railroad Engineer's Pocket Companion for the Field:

Comprising Rules for Calculating Deflection Distances and Angles, Tangential Distances and Angles, and all Necessary Tables for Engineers; also the Art of Levelling from Preliminary Survey to the Construction of Railroads, intended Expressly for the Young Engineer, together with Numerous Valuable Rules and Examples. By W. Griswold. 12 mo., tucks $1.75

GRUNER. - Studies of Blast Furnace Phenomena:

By M.L. Gruner, President of the General Council of Mines of France, and lately Professor of Metallurgy at the Ecole des Mines. Translated, with the author's sanction, with an Appendix, by L.D.B. Gordon, F.R.S.E., F.G.S. 8vo. $2.50

GUETTIER. - Metallic Alloys:

Being a Practical Guide to their Chemical and Physical Properties, their Preparation, Composition, and Uses. Translated from the French of A. Guettier, Engineer and Director of Founderies, author of "La Fouderie en France," etc., etc. By A.A. Fesquet, Chemist and Engineer. 12mo. $3.00