French geophysicist, astronomer, and chronobiologist (1678–1771) whose experiments began the study of circadian rhythms. Manuscript DS in French, signed “D'Ortous de Mairan,” one page, 6.5 x 4.25, November 16, 1738. Untranslated receipt for 327 livres. In fine condition, with expected document wear. Pre-certified PSA/DNA.
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