German scientist and pioneer of chemotherapy (1854–1915) who was co-awarded the Nobel Prize for Medicine with Ilya Ilyich Mechnikov in 1908. ALS in German signed “P. Ehrlich,” three pages on two adjoining sheets, 4.5 x 7, personal letterhead, no date. Handwritten letter of thanks, in part: “Excuse me for only now getting around to expressing my most heartfelt thanks for your precious shipment. You can surely imagine the joy and excitement with which I received it; I remain and always feel deeply indebted to you. Naturally, I am considering the material according to the following scale: Thiamine / Methylene Azure / Methylene Blue / Thianaline/ Methylene Violet Thianol. Thus, among the tested substances, Thiamine is the easiest to reduce, and Thianol is the hardest to reduce.” In fine condition.
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