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Holtzapffel, 1088, O. A New System of Scales of Equal Parts. Applicable to the various purposes of Engineering, Architectural and General Science. By Charles Holtzapffel. London, 1838.

Johnson, 993, O. A Report to the Navy Department of the United States, on American Coals applicable to Steam Navigation, &c. By Walter R. Johnson. Washington City, 1844. La Lande, 12 & 999, F. Des Canaux de Navigation et specialement du Canal de Languedoc. 2 copies. Par M. de La Lande. Paris, 1778.

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354, F. Report of Committee on Wet Docks. 1796.
Reports on Broad Wheels and Turnpike Roads.
Reports of the Commissioners for Making and
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827, F. Reports from Committee on the Highways and Turnpike Roads in England and Wales. 4 vols.

1032, F. Report of the Commissioners on Metropolis Improvement.-1st. 1844.

1033, F. Second Report of Committee on Improvements of the Port of London.

1034, F. Report of the Select Committee on the London Bridge. 1801.

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1799.

Long, 441, O. Proceedings of the Board of Engineers of the Baltimore and Ohio Railroad Company, from its organization to

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1825.

M'Williams, 1014, Q. Essay on the Origin and Operation of the Dry-Rot, with a View to its Prevention or Cure: to which are annexed Suggestions on the Cultivation of Forest Trees, &c. By Robert M'Williams. London, 1818.

Macneill, 1136, Q. The Resistance of Water to the Passage of Boats upon Canals, and other Bodies of Water; being the Results of Experiments made by John Macneill Esq., C. E. London, 1833.

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Millington, 722, O. Elements of Civil Engineering. By J. Millington. Philadelphia, 1839.

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Mudge, 760, Q. A Trigonometrical Survey of England and Wales, from 1784 to 1799. By Captain W. Mudge & J. Dalby. 2 vols. London, 1799 and 1801.

Muller, 757, O. A Treatise containing the Elementary part of Fortification. By John Muller. London, 1746.

Murray, 480, O. A Treatise on Practical Surveying and Topographical Plan Drawing. By John Murray. London, 1829. Navier, 656, O. Résumé des Legons Données a l'Ecole des Ponts

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New York Canal Commissioners, 356, O. The Official Reports of the Canal Commissioners of the State of New York, and the Acts of the Legislature respecting Navigable Communications between the Great Western and Northern Lakes and the Atlantic Ocean, with Perspicuous Maps and Profiles. Published at the Request of the Board of Canal Commissioners. Newburgh, 1817.

New York Canals, 881, O. Laws of the State of New York in relation to the Erie and Champlain Canals, together with the Annual Reports of the Canal Commissioners, and other Documents requisite for a Complete History of those Works. Also, Correct Maps, delineating the Routes of the Erie and Champlain Canals, and designating the Lands through which they pass. 2 vols. Albany, 1825.

Nichols, 200, O. Historical Account of the Navigable Rivers, Canals, and Railways of Great Britain. London, 1831.

Osborne, 983, D. The London and Birmingham Railway Guide, illustrated with Engravings and Maps. By E. C. & W. Osborne. Birmingham.

Pambour, 543 & 591, O. A Practical Treatise on Locomotive Engines upon Railroads. By Chev. F. M. G. de Pambour. 2 copies. Philadelphia, 1836.

Partington, 552, O. A Descriptive Account of the Steam Engine, and on Steam Navigation. By Charles F. Partington. London, 1836.

Pasley, 698, O. Observations on Limes, Calcareous Cements, Mortars, Stuccos, and Concrete. By C. W. Pasley. London, 1838.

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Sganzin, 632, O. Elementary Course of Civil Engineering. Translated from the French of M. J. Sganzin. Boston, 1837. Shriver, 537, O. Survey and Examination relative to the Chesapeake & Ohio, and Ohio & Lake Erie Canals. By J. Shriver. Baltimore, 1824.

Simms, 550, O. Treatise on the Principles and Practice of Leveling. By F. W. Simms. London, 1837.

651, F. Public Works of Great Britain. By F. W. Simms. London, 1838.

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Stephenson & Locke, 91 & 92, O. Observations on the Comparative Merits of Locomotive and Fixed Engines, as applied to Railways. By Robert Stephenson & Joseph Locke, Civil Engineers. 2 copies. Philadelphía, 1831.

Strickland, 14, Q. Reports on Canals, Railways, Roads, &c., to the Pennsylvania Society for the Promotion of Internal Improvements. By William Strickland. Philadelphia, 1826.

Stuart, 347, D. Historical and Descriptive Anecdotes of Steam Engines, and their Inventors. By Robert Stuart. 2 vols. London, 1829.

Tanner, 196, D. Memoir on the recent Surveys, Observations, and Internal Improvements in the United States. By H. S. Tanner. Philadelphia, 1829.