Pioneering French microbiologist and chemist (1822–1895) who demonstrated the germ theory of disease and developed the first vaccine against rabies. ALS in French, signed “L. Pasteur,” one page, 4.25 x 6.5, August 23, 1887. In full (translated): “I am very touched with the honor you would give me. At what point would laboratory work allow me to write what you want and to become one of your collaborators? I would not be able to say. But I do congratulate your friends who spiritually opposed your desire to retire.” In fine condition, with a few small wrinkles and light toning. Accompanied by a handsome original unsigned vintage cabinet portrait, an unsigned postcard portrait, and several other pieces of related ephemera including pages from period publications related to Pasteur. Pre-certified PSA/DNA and RR Auction COA.
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