Mary B. Moarn (c.1850-?) was a student of Mary Baker Eddy's, studying with her in October 1882 and joining the Christian Scientist Association the following month. She joined the Church of Christ (Scientist) in December 1882, but there is no record of her uniting with The First Church of Christ, Scientist. Moarn was listed as a Christian Science practitioner in The Christian Science Journal from 1883 to 1888, and records suggest she maintained a healing practice in Boston up until 1892.

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