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British physician and physiologist John S Haldane FRS (1860-1936) in 1920

Haldane was famous for his intrepid self-experimentation, which led to many important discoveries about the nature of gases and their effect on the human body. Half-length photograph, seated at desk, full face. Interior view of his office at his residence on Linton Road, Oxford. (Source: U.S. Library of Medicine, Bethesda, Maryland. Public domain.)

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