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. Vintage sepia 4.25 x 5.5 cabinet photo, signed and inscribed in fountain pen in French to Cecile, signed “L. Pasteur, Paris, 1 November 1893.” Cloth matted and framed to an overall size of 9.5 x 11. In fine condition, with 1″ surface crack to left side between signature and date, not affecting overall image and a few light spots. COA John Reznikoff/PSA/DNA and R&R COA.
