Emma Hardinge Britten

According to Readers Guide to The Mahatma Letters to A. P. Sinnett:

Britten, Emma Hardinge, a well-known spiritualist in America, elected one of the Councillors of the TS at the organizing meeting in New York on September 7, 1875 (SH, p. 82). Some of the early meetings of the TS were held in her home (SH, p. 100). Author of the book, Art Magic, which she announced was written by "an adept" of her acquaintance, Louis Constant (apparently not the one who used the pseudonym of Éliphas Lévi) for whom she was "acting as translator and secretary." She left the TS fairly soon, however, became hostile, and joined with Prof. Coues and others in spreading calumny about HPB. See biography, HPB I: 466-7; ML, p. 50; SH, pp. 111, 275.