Autograph Letter Signed, explaining that pressure of work prevents him accepting honorary membership of a society for statisticians. In French. 1 page 9 x 7 inches, surface creasing, other blemishes. 1 May 1834. Louis Jacques Thénard (1777-1857), French chemist, author of the standard work Traité de chimie élémentaire, théorique et pratique (4 vols., Paris, 1813–16). In 1806 he analysed the chemical composition of the Alais meteorite, which fell in Alès on 15 March, 1806. His first original paper (1799) was on the compounds of arsenic and antimony with oxygen and sulphur. In 1807, he began important research into ethers. His researches on sebacic acid (1802) and on bile (1807) deserve mention as well, as does his discovery of hydrogen peroxide (1818). In 1799 he developed the pigment known as Thénard’s blue in response to a request by Jean-Antoine-Claude Chaptal for a cheap colouring matter.