Mary D. Fuller (c.1834-1893) was born in New York and died in Columbus, Wisconsin. She was the second wife of Lucius Fuller, a prominent dry goods merchant in Columbus, Wisconsin. She was a student of Mary Baker Eddy's, studying with her in February 1884 and joining the Christian Scientist Association on March 5, 1884. Fuller's interest in Christian Science ended in October 1888 when she withdrew from the Association. There is no record of her uniting with the Church of Christ (Scientist).

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