ALS in French, signed “L. Pasteur,” one page, 5.25 x 8.25, August 20, 1874. Handwritten letter expressing admiration for a mentor, perhaps one of his teachers or even Emperor Napoleon III, who supported his research. In part (translated): "I am very sensitive to your gracious message and I am delighted to have given you the opportunity to think again to the good man whose memory is so dear to you and to whom I have since a long time devoted infinite gratitude." In fine condition, with one small stain touching one word of text.
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