French chemist (1800-1884) best known for his work in determining atomic and molecular weights. ALS in French, signed “J. Dumas,” one page, 7 x 9.75, no date. In part (translated): "Please authorize Mr. Mabrun…to take a copy of the report I made here at the academy. He was missing a few pages…and he was ready to finish when he got the manuscript written." In fine condition, with some scattered staining.
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