Russian biologist and zoologist (1845-1916) best known for his pioneering research into the immune system, for which he was awarded the 1908 Nobel Prize in Physiology or Medicine. Untranslated ALS in French, one page, 4.25 x 5.5, postmarked December 11, 1905. Addressed from the Pasteur Institute, a handwritten letter to Monsieur Mariani. In fine condition.
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