French chemist and politician (1827–1907). ALS in French, signed “M. Berthelot,” one page both sides, 5 x 8, no date. Letter to an unidentified gentleman. In part: “I’m afraid [I] forgot to answer your letter you wrote to me…My book of thermochemistry will be published in October…You could find information in my memoirs…What you are looking for of numerical data in the Directory of the Board of Longitudes for 1894.” Intersecting folds, one through a single letter of signature, trimmed vertical edge, a uniform shade of mild toning, and a small label affixed to top edge of front, otherwise fine condition. RRAuction COA.
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