French scientist and bacteriologist whose studies on fermentation led to the conclusion that it was caused by bacteria, proving the germ theory of disease; he also developed a successful vaccine for rabies, which hitherto had been universally fatal. ALS in French, signed 'L. Pasteur,' one page, 4.25 x 7, Institut Pasteur letterhead, June 29, 1894. Letter to a friend, in untranslated French, concerning an upcoming meeting. In very good condition, with some light toning and wrinkling, stains near lower edge affecting portion of last name and a bisecting horizontal mailing fold. COA John Reznikoff/PSA/DNA and RRAuction COA.
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