French chemist (1786-1889) known for his work with fatty acids, who is credited with the discovery of margaric acid, creatine, and designing an early form of soap made from animal fats and salt. Untranslated ALS in French, signed “Chevreul,” one page, 5.25 x 8.25, Museum d'Histoire Naturelle letterhead, March 20, 1878. In fine condition.
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