493px-Silas_Weir_Mitchellsm

photo of Mitchell

Photograph of Silas Weir Mitchell, 1881. This image is in the public domain in the United States because its copyright has expired. From Images from the History of Medicine: http://ihm.nlm.nih.gov/luna/servlet/detail/NLMNLM~1~1~101433810~184749:-Silas-W–Mitchell-?qvq=q:Mitchell+;lc:NLMNLM~1~1&mi=41&trs=68. Courtesy of Wikimedia Commons: http://en.wikipedia.org/wiki/File:Silas_Weir_Mitchell.jpg