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Tredgold, 560, Q. Elementary Principles of Carpentry. By Thomas Tredgold. Philadelphia, 1837.

882, O. Principles of Warming and Ventilating Public Buildings, &c. By Thomas Tredgold. London, 1824.

Véil, 695, F. Projet d'un Monument Consacré à l'Histoire Naturelle. Par Charles F. Véil. Paris, 1779.

Vitruvius, 1, F. L'Architettura di M. Vitruvio Pollione colla traduzione Italiana e Comento del Marchese B. Guliani. Napoli, 1758.

598, F. Architecture of M. Vitruvius Pollio: translated

from the original Latin. By W. Newton, Architect. 2 vols. London, 1791.

Wilson, 965, D. Description of the New Royal Exchange; including a Historical Notice of the Former Edifices. By Effingham Wilson. London, 1844.

Wotton, 872, O. The Elements of Architecture; collected by Henry Wotton. London, 1624.

PERIODICAL.

London, 438, O. The Architectural Magazine. 5 vols.

Astronomy.

Arago, 481, D. Scientific Notices of Comets in general, and in particular of the Comet of 1832. By M. Arago. Translated by Col. Charles Gold. London, 1833.

Bonnycastle, 580, O. Introduction to Astronomy. By John Bonnycastle. London, 1787.

Bradford, 647, Q. The Wonders of the Heavens; being a Popular View of Astronomy. By Duncan Bradford. Boston, 1837.

Ferguson, 123, O. An Easy Introduction to Astronomy. By James Ferguson. 4th edition. London, 1779.

Gilliss, 1101, O. Astronomical Observations made at the Naval Ob

servatory, Washington, D. C., under the orders of the Secre

tary of the Navy. By Lt. J. M. Gilliss, U. S. N. Washington, 1846.

Gummere, 124, O. An Elementary Treatise on Astronomy. By John Gummere. Philadelphia, 1822.

582, O.

Guy, 333, D.

Guy's Elements of Astronomy, and Keith on the

Use of the Globes. Philadelphia, 1831.

Herschell, 485, D. A Treatise on Astronomy. By Sir John F. w. Herschell. With a Preface and a Series of Questions. By S. C. Walker. Philadelphia, 1836.

Humboldt, 587, Q. Recuil d'Observations Astronomiques, d'Operations Trigonomètriques, et de Mesures Barometriques. Par Alexander de Humboldt. 2 vols. Paris, 1810.

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and Geography. By B. Martin. 3 vols. London, 1771. Maskelyne, 774, O. Tables Requisite to be Used with the Nautical Ephemeris, for Finding Latitudes and Longitudes at Sea. By Nevil Maskelyne. London, 1781.

Mayer, 762, Q. Tabulæ Motuum Solis et Lunæ. Auctore Tobia Mayer. London, 1770.

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Towle, 125 & 172, D. A Grammar of Astronomy. By J. Towle. 2d edition. Philadelphia, 1826. 2 copies.

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Biography.

Aiken, 149, O. Memoir of John Aiken. By Lucy Aiken. Philadelphia, 1824.

Anonymous, 364, D. Authentic Biography of Col. Richard M. Johnson, of Kentucky. New York, 1833.

Barton, 1092, O. Memoirs of the Life of David Rittenhouse, LL. D., with an Appendix. By William Barton. Philadelphia, 1843. Colden, 341, O. The Life of Robert Fulton. By Cadwallader D. Colden. New York, 1817.

Delaplaine, 420, Q. Repository of the Lives and Portraits of Dis

tinguished Americans. By Joseph Delaplaine. Philadelphia. Drake, 418, O. Biography and History of the Indians of North America. By Samuel G. Drake. Boston, 1834.

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Grimshaw, 158 & 372, D.

The Life of Napoleon, with the History of
France from the Death of Louis XVI. to 1821. By Wil-
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Humphreys, 863, D. Life of Major Gen. Israel Putnam. By Col.

David Humphreys; with Notes and Additions, and with an
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Irving, 703, O.

History of the Life and Voyages of Christopher Columbus. By Washington Irving. 2 vols. Philadelphia, 1838.

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Memoirs of William Smith, LL. D. By

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Sanderson, 604, O. Biography of the Signers of the Declaration of Independence. By John Sanderson. 9 vols. Philadelphia,

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Tudor.

2

Catalogues of Libraries.

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Maison de Commission, Catalogue. Par Hec-
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Cincinnati, 1148, O. Catalogue of the Young Men's Mercantile Library Company. 1846.

Harris, 202, O. Catalogue of the Library of the Royal Institution of
Great Britain. By William Harris. London, 1821.
New York, 969. Catalogue of the Mercantile Library Company of
New York, 1844.

Philadelphia, 567, O. Catalogue of Philadelphia Library. 2 vols.

1835.

568, O. Catalogue of Books in the Loganian Library. 1837. 943, O. Catalogue of Books added to the Library of the Library Company of Philadelphia since the large Catalogue of 1835, to January, 1844.

Chemistry.

Accum, 482, D. A Treatise on Making Bread. By Frederick Accum. London, 1821.

Appert, 789, O. L'Art de Conserver. Par Appert. Paris, 1810. Buche, 473, O. A System of Chemistry. By Franklin Bache. Philadelphia, 1819.

Becquerel, 967, Q. Elements d'Électro-Chimie, Appliquee aux Sci

ences Naturelles, et aux Arts. Par M. Becquerel. Paris, 1843. Bergman, 49, O. Physical and Chemical Essays. By T. Bergman. Translated by E. Cullen. 2 vols. London, 1784. Berthier, 398, O. Traité des Essais par la Voie Sèche. Par M. P. Berthier. 2 vols. Paris, 1834.

Berthollet, 51, O. Essay on Chemical Statics. By C. L. Berthollet. Translated by B. Lambert. 2 vols. London, 1804. 52, D. Researches into the Laws of Chemical Affinity. By