Russian biologist and zoologist (1845-1916) best known for his pioneering research into the immune system for which he, with Paul Ehrlich, was awarded the 1908 Nobel Prize in Physiology or Medicine. ALS in French, one page, 4.75 x 5.75, December 18. An untranslated handwritten letter to French art historian and essayist Élie Faure. In fine condition, with a small split to the end of the central horizontal fold.
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