German medical scientist (1843–1910) regarded as the father of bacteriology. He isolated the tuberculosis bacillus and the anthrax virus, and received the Nobel Prize in physiology or medicine in 1905. ALS in German, signed “R. Koch,” three pages on two adjoining sheets, 4.5 x 7, April 5, 1892. Letter to his Privy Counsellor, possibly Rudolf Virchow, at the Institute for Infectious Diseases. In full (translated): “On this journey of my sick leave the weather has been so abominable that I have not been able to recover very well. I still feel quite weak and I would like to request a few weeks of additional vacation time—something you hinted at as a possibility before I left. I am taking the liberty of sending this letter to your home address directly so that my request might get into your hands more speedily. I would be very grateful if you could obtain a positive answer for me. I have followed the frequently skimpy newspaper accounts regarding the events taking place in Berlin with growing astonishment. At times I thought I was reading fairytales! I hope that the direction that has apparently been taken will be continued for a long time.” In fine condition. At this time, Berlin was in turmoil. The undercurrent of Socialism which Wilhelm I tried to suppress began to take hold with the people, threatening not only the German Empire, but all the royal crowns of Europe. Pre-certified PSA/DNA and RR Auction COA.
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