Photograph of William G. MacCallum. Signature: “W. G. MacCallum.” Manuscript note on verso: “Wm. G. McCallum under whom I learned to be a pathologist, 1923-1930, WDF.”
Sudhoff and Welch facing each other, with a pillar and a stone wall in the background, Sudhoff is holding a drinking glass. Text: "Prof. Karl Sudhoff and Dr. William H. Welch at a convention in Bad Homburg, Germany, in 1927. Courtesy of Dr. Arnold C....