Ehrlich, Paul, pathologist and serologist, founder of chemotherapy, Nobel Prize winner (1854-1915). Eigh. Postcard and mach. Letter from the U.S. "Paul J. Honest" or "P Honesty". 2 p. 8vo and gr. 4to. Frankfurt a. M. (3.III.1909) and 28.XII.1912. To the Friedländer & Sohn bookstore in Berlin. On the postcard Ehrlich orders a number of scientific works from Friedländer's catalogue 1909/I. - In the machine-written letter he reports: "... In reply to your card I inform you that unfortunately I no longer have a copy of my 'oxygen need of the organism'. However, the monograph was published (1885) by Hirschwald publishing house and you might be able to obtain the same ..." - According to the printed letterhead, Paul Ehrlich lived in Frankfurt in 1912 in the "Paul Ehrigkeit-Strasse".