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Heart-block research clamp.

Envelope includes a reprint of Erlanger's "A report of some observations of heart-block in mammals," and a typed note that reads: "Clamp devised by Dr. Erlanger which permitted him to apply reversibly controlled pressure to the auricular-ventricular bundle of a dog's beating heart, thus enabling him to reproduce experimentally all desired degrees of heartblook. See attached reprint. (Johns Hopkins Bulletin, 16:234, 1905)."

Henry Schwarz seated, smoking a cigar.

Included in the folder is a short letter from Schwarz dated May 2, 1928 that reads: "My dear Mr. Soule, Yours of April 30th with enclosure was received yesterday and much appreciated. Yours and my account with Barnes Hospital are now squared and closed so please do not mention the matter anymore and oblige. Yours sincerely, Henry Schwarz."

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