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. ALS in French, one page on a light green 4.5 x 5.25 airmail postal card, September 25, 1902. An untranslated letter to French art historian and essayist Élie Faure. In fine condition.
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