The man in this glass slide is William Terry (1836-1913), leader of the Victorian Spiritualist movement in Australia. When spiritualism became popular in Victoria, Terry and his father gave up their drapery business for full-time mediumistic work.
William became a spiritualist bookseller, medium, trance and magnetic healer, and clairvoyant herbalist in Russell Street, Melbourne. His shop became the headquarters of the movement. In September 1870 he launched the Harbinger of Light, which became the Australasian publication of the faith.