This folder includes 5 postcards sent to Dr. Erlanger: (1) Alexandre Herzen (Lausanne, Switzerland) to Erlanger (John Hopkins University) dated 01/16/1903. (2) Thomas Heart, editor of “Heart” a journal for the study of the circulation, to Erlanger (University of Wisconsin) dated 07/09/1909. (3) Sir Edward Sharpey Schafer (University of Edinburgh) to Erlanger (Washington University) dated 04/19/1928. (4) Frederick R. Miller (University of Western Ontario, Canada) to Erlanger (Washington University) dated 05/17/1928. (5) Blank postcard pre-printed with Erlanger’s University of Wisconsin address. Accession 2015-013.