Portrait of Paul Ehrlich, by H. Hinkley. 20th century. Ehrlich is holding a document, possibly labeled "Salvarsan," which was known as the magic bullet against syphilis. Photograph by Will Brown. The Institute Collections.

Portrait of Paul Ehrlich, by H. Hinkley. 20th century. Ehrlich is holding a document, possibly labeled “Salvarsan,” which was known as the magic bullet against syphilis.

Photograph by Will Brown. The Institute Collections.