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1. Rafinesque, Constantine Samuel, 1783-­1840. New York, Apr. 25­ Oct. 1, 1817. 2 items. [Is offended because Academy requires specimens or drawings, to verify discoveries it publishes; withdraws his two papers, which he had sent in for publication; mentions Thomas Say's book on American land and fresh water shells as a Base of American Conchology, his own Annals of Nature, etc.] 2. Raguet, Condy, 1784­-1842. Rio de Janeiro, Oct., 1822 ­ Dec. 15, 1823. 2 items. [Offers to obtain scientific specimens; describes Indians and difficulties of obtaining a skull from a Butecudos tribe member for Dr. Harlan; note on front, from Dr. Harlan, urges Reuben Haines to suggest decapitation] 3. Randall, John. Boston, July 4, 1816. [Acknowledges election to Academy] 4. Redman, R S , Halifax, N.S., Feb. 25, 1822. 5. Ricord, Philippe, 1800­ , and Alexandre, 1798­ . Paris, Nov. 12, 1822. [Send a collection of the water and land shells of Paris, in hopes that they may become members of Academy] 6. [Risso? ?] [n.p.] Jan. 29, 1823. [Acknowledges election as correspondent of Academy; sends a work of his own on Natural History] 7. Rizzi, Filippo. [Naples] read, Apr. 3, 1821. [Presents several memoirs on subjects connected with agriculture] (In Italian) 8. Robbins, Eliza. Letter to Joseph Lyman, of Northampton. Phila., Oct. 2, 1830. [Introducing Reuben Haines] 9. Rockwood, E B . [n.p.] Received, 3mo. 18, 1818. 10. Royal Institution of Great Britain. [London] April 17, 1820. [Acknowledges receipt of Journals of Academy] (Signed, Thomas Harrison, Secy. R. I. ) 11. The Royal Society. London, Jan. 29, 1818. [Acknowledges receipt of Journal of Academy] (Signed, Thomas Young, M.D., Secy.) 12. Rush, Benjamin, M.D., 1745-­1813. Phila., Oct. 23, 1812.