The Van Nostrand Science Series.
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No. 61.-POTABLE WATER AND THE DIFFERENT METHODS OF DETECTING IMPURITIES. By Charles W. Folkhard.
No. 62-THE THEORY OF THE GAS ENGINE. By Dougald Clerk. Second edition. With additional matter. Edited by F. E. Idell, M.E.
No. 63.-HOUSE DRAINAGE AND SANITARY PLUMBING. By WV. P. Gerhard. Fourth edit ion. Revised.
No. 64.-ELECTRO-MAGNETS. By Th. du Moncel. 2d revised edition.
No. 65.-POCKET LOGARITHMS TO FOUR PLACES OF DECIMALS.
No. 66.-DYNAMO-ELECTRIC MACHINERY. By S. P. Thonpson. With notes by F. L. Pope. Third edition.
No. 67.-HYDRAULIC TABLES BASED ON KUTTER'S FORMULA." By P. J. FIynn.
No. 68.-STEAM-HEATING. By Robert Briggs. Second edition, revised, with additions by A. R. Wolff.
No. 69.-CHEMICAL PROBLEMS. By Prof. J. C. Foye. Second edition, revised and enlarged.
No. 70.-EXPLOSIVES AND EXPLOSIVE COMPOUNDS. By M. Bertholet.
No. 71.-DYNAMIC ELECTRICITY. By John Hopkinson, J. A. Schoolbred, and R. E. Day.
No. 72.-TOPOGRAPHICAL SURVEYING. By George J. Specht, Prof. A. S. Hardy, John B. McMaster, and H. F. Walling.
No. 73.-SYMBOLIC ALGEBRA: OR, THE ALGEBRA OF ALGEBRAIC NUMBERS. By Prof. W. Cain.
No. 74.-TESTING MACHINES: THEIR HISTORY CONSTRUCTION, AND USE. By Arthur v. Abbott.
No. 75.-RECENT PROGRESS IN DYNAMO-ELECTRIC MACHINES. Being a Supplement to Dynamo-Electric Machinery. By Prof. Sylvanus P. Thompson.
No. 76.-MODERN REPRODUCTIVE GRAPHIC PROCESSES. By Lieut. Janes S. Pettit, U.S.A.
No. 77.-STADIA SURVEYING. The Theory of Stadia Measurements. By Arthur Winslow.
No. 78.-THE STEAM-ENGINE INDICATOR, AND ITS USE. By WV, B. Le Van.
No. 79.-THE FIGURE OF THE EARTH. By Frank C. Roberts, C.E.
No. 80.-HEALTHY FOUNDATIONS FOR HOUSES. By Gleun Brown.
