Superb ALS signed “L. Pasteur,” one page, 4.25 x 6.75, Institut Pasteur letterhead, April 5, 1890. Letter to brewer Prosper Tourtel, in full (translated): "I hasten to answer your letter of April 3rd, and I am very touched by the homage shown to me by all the members of the Brewers Syndicate of Eastern France, in offering me the honorary Presidency of their association. I accept with gratitude and bliss the notification has been given to me by the representative of the grand Tourtel brewery to whom I am sending my most affectionate regards." In fine condition. Accompanied by the original hand-addressed mailing envelope.
Pasteur engaged in the study of fermentation as the director of scientific studies at Ecole Normale, leading to the 1865 patent and invention of 'pasteurization'—an important heating treatment which eliminates unwanted and potentially harmful microorganisms in beverages like beer, milk, and wine. The brothers Jules and Prosper Tourtel founded the Tourtel brewery in 1839 in Tantonville in Meurthe-et-Moselle, the location where Ferdinand Carré started the first refrigeration machine, Dr. Baud invented pneumatic malting and, in 1873 and 1874, where Pasteur carried out his studies on fermentation. During his time at Tourtel, Pasteur used beer-making as a pretext to develop theories about alcoholic fermentation, the origin of wine yeast, and even of the transformation of species.
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