Christison requesting Playfair's opinion of a thesis which he describes as "an incomplete investigation of a difficult subject."
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Christison, Robert, Sir. “Letter from Robert Christison to Lyon Playfair,” circa 1842–1882. Szymanowitz Autographed Letter Collection, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/2801pg356.
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