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. LS in French, signed 'L. Pasteur,' two pages on two adjoining sheets, 4.5 x 6.75, Institut Pasteur letterhead, . Letter of recommendation for a protege. In part, 'I already told you...of young Jules Le Dantec...a candidate for admission at St. Cyr military school... I particularly recommend this young man, who in fact, is his own best recommendation. His teachers are very happy with him, and, this year, he was awarded his class's first prize for excellence.' In fine condition, with a horizontal mailing fold. RRAuction COA.
