Archibald Scott Couper. Photograph of drawing (not before 1860). Courtesy Edgar Fahs Smith Collection, Kislak Center for Special Collections, Rare Books and Manuscripts, University of Pennsylvania.

Archibald Scott Couper. Photograph of drawing (not before 1860).

Courtesy Edgar Fahs Smith Collection, Kislak Center for Special Collections, Rare Books and Manuscripts, University of Pennsylvania.