French physiologist who was a pioneer in experimental brain science and the use of anesthesia (1794–1867). Two untranslated ALSs in French: an ALS signed “Flourens,” one page, 5 x 8, Institut de France letterhead, November 27, 1846; and an ALS signed “Flourens,” one page both sides, 4.75 x 7.25, December 15, 1857. Foxing to the earlier letter and show-through from writing to opposing sides of the later letter, otherwise overall fine condition. Pre-certified PSA/DNA.
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