M

1. McEuen, Thomas, Jr. Washington, Pa., Nov. 19, 1821. [Tells of a well, recently dug, which emits hydrogen gas] 2. Maclure, William, 1763-­1840. Paris and Mexico, 1819­-1831. 5 items. [Gives summary of books shipped to the Academy; Mexican letters, mainly business] 3. MacNeven, William James, M.D., 1763­-1841. New York, May 14, 1815. [Discusses different kinds of laboratories and what equipment they need; acknowledges election as correspondent of Academy] 4. Mason, Hyde P. [n.p., n.d.] To Thomas Say. [Asks him to present to Academy a collection of land and fresh water shells] 5. Mease, Dr.James, 1771­-1846. Phila., June 20, 1816. 6. Milbert, Jacques Gerard, 1766-­1840. New York, March 2, 1823. (In French) [Acknowledges election as correspondent of Academy] 7. Minturn, R[obert] B[rowne] 1805-­1866, nephew of Reuben Haines. 4 items, Oct. 2, 1824 ­ Jan. 25, 1825. [Concern materials shipped to Academy from abroad and Minturn's efforts to get them through Customs, etc.] 8. Mitchell, Samuel L , M.D., 1792­-1868. New York, 1814-­1820. 11 items. [letter (copy) of March 26, 1814, to John F. Waterhouse, M.D., tells of sea­faring friend, Capt. Bool, who saw a sea­animal bigger than a whale and different from it; July 22, 1817. tells of white mountain sheep of North America; sends publications and specimens to Academy; praises publications of Academy; speaks of lecturing with Whitlow's botanical transparencies (see Griscom); tells of 40­foot shark skeleton found in North Carolina; tells of curiosities and specimens recently seen and acquired]