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1. Say, Thomas, naturalist, 1787-­1834. New Harmony, Ind., 1829­-1830. 7 items. [Explains why he stays in New Harmony; discusses difficulties of obtaining boxes of specimens, etc.; that he has ordered to be shipped to him; financial matters] 2. Sealy, James. Cork, April 26, 1820. [Says he is sending a present of books to the Academy; would like to correspond] 3. Serra, J. Correa de. Washington, March 20, 1819. 4. Seray, Pierre. Le Havre, 1818­-1820. 4 items (with 3 enclosures) [Bills of lading for books from Mr. Maclure] 5. Shotwell, William. New York, 1820-­1823. 2 items. [Agricultural] 6. Silliman, Benjamin, 1779­-1864. New Haven, 1815­-1824. 5 items. [Acknowledges election as correspondent of Academy; tries to get straightened out about shipments of books from Mr. Maclure,some of which were meant for Phila. Acad. and some for the American Geological Society] 7. Smith, Joseph P. Burlington, 6mo. 15, 1820. [About clover] 8. Smith, Richard M. Green Hill, 7mo. 13 ­ 8mo. 12, 1816. 2 items. [Concerns sale of sheep and lack of market for them] 9. Smith, Robert, 1757­-1842, Secy. of Navy and State. Baltimore, May 23, 1823. [About Alderney cattle] 10. Sowerby, James de Carle, 1787-­1871. London, 1817­1818. 2 items. [Acknowledges Academy's Journal; sends his own, "Elucidation of Colours;" wants to exchange specimens of fossil shells and meteorites] 11. Steinhauer, H . Bethlehem, Pa., June 7 ­ Nov. 4, 1817. [Acknowledges election to Academy; sends book for Academy library] 12. Sternberg, Gaspar, Comte. Prague, 1821­-1824. 3 items (in French) [Sends the Academy his book about the flora of the prehistoric world; raises question as to whether or not vegetable fossils in the coal fields of the Meganique Mts. region of the old world are different from those in the coal fields of America; acknowledges election as correspondent of Academy; sends vols. 2 and 3 of his geognostico­botanic studies of the flora of the prehistoric world world; discusses contents of future volumes] 13. Streater, Charles. Hanover near Wilkesbarre, 1827­-1829. 2 items. 14. Struve, Baron von Extract of letter to Dr. William Meade, communicated by him through William S. Warder, Hudson, N.Y., Aug. 7, 1824. [Baron von Struve sends box of minerals (35 specimens) to Academy; acknowledges election to Academy] 15. Sullivan, Richard. Boston and Brookline, 1818-­1830. 3 items.