Helena Petrovna Blavatsky and Henry Steel Olcott in 1888
Theosophical Society President-Founder Col. Henry Steel Olcott wrote about his first encounter with the woman who would be the society's Co-Founder/Corresponding Secretary, Madame Helena Petrovna Blavatsky, in Old Diary Leaves (1895) and his case study of paranormal phenomena People From The Other World (1875). The latter chronicled the various phenomena associated with the mediumship of brothers William and Horatio Eddy at their homestead in Chittenden, Vermont. The book included reports that had originally appeared in The Daily Graphic newspaper. Sketches by Alfred Kappes and T. W. Williams offer precise depictions of incidents at the homestead.
William H. Eddy (left) and Horatio G. Eddy
The phenomena included materializations of people who'd made the transition to the afterlife, direct voice (disembodied) communication, and spirit-writing.

