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1. Lacepede, Bernard Germain Etienne de la Ville, Comte de, 1756-­1825. Paris, Nov. 15, 1817. [Acknowledges receipt of first three numbers of the Academy's Journal; mentions his own corresponding membership; says the Academy will set an example in encouraging the study of the natural sciences that will be followed in both No. and So. America.] (In French) 2. Lawton, E L Phila., July 7, 1817. [Thanks for pamphlets; sends shell specimens] 3. Leach, Dr. William Elford, 1790-­1836. British Museum, London, 1818-1819. 3 items. [Acknowledges election as corresponding member of Academy; will send a collection of the general and species of crustacea; also will give the Academy all his works, as soon as published; requests specimens in exchange; acknowledges Journals; sends tracts] 4. Lederer, Baron . Extract of letter to John Vaughan. Jan. 21, 1823. [Sends specimens from D. Schreiber of Imperial Academy of Natural Sciences at Vienna and offers more] (With note from John Vaughan, Phila., Feb. 11, 1823, saying he will forward communications to Baron Lederer) 5. Legaux, Pierre. Springmill, 1812­-1822. 5 items (in French) [Acknowledges election as Academy correspondent; sends meteorological table of observations for 1813] 6. Lefroy , Inspector of Studies, Royal School of Mines, Paris. Paris, 1811­-1820. 2 items (in French) [Acknowledges receipt of Academy's Journal, for the Royal School of Mines; will send the Mining School Annals, in return; acknowledges election as corresponding member of Academy] 7. Lewes, Joseph S Phila., July 18, 1825. [Says General Lafayette will visit Germantown and asks R. Haines to make arrangements; note on back by R. H. tells of visit after it occurred] 8. Linnean Society. London, July 16, 1818. [Acknowledges issues of Academy's Journal. (Signed, Alex. [McKay?] Secy.) 9. Littell & Henry, literary agents. Phila., Sept. 4, 1818. [State terms on which they would agree to promote sale of Journal of Academy.] 10. Lowber, John C. Aug. 13 [n.p., n.d.] 11. Lucas, , Assistant Curator of the King's Natural History Collection. Paris, Aug. 19, 1817. (In French) [Acknowledges election as correspondent of Academy; offers in exchange his own methodical Table, or chart, of mineralogical species] 12. Lukens, Isaiah. London, Dec. 29, 1826. [Describes attempted operation for kidney stones, for which he had invented the instrument; Lukens describes the "depraved" condition of London's lower classes]