Joseph Bloodgood was the son of Francis Bloodgood.
He is mentioned in JW's correspondence about 1892. He may have been Joseph Colt Bloodgood (1 November 1867-22 October 1935) who worked at Johns Hopkins Hospital, Baltimore, 1892-1935.
Who Was Who In America, vol. 1, 1897-1942, Chicago, 1943, p. 109.