Mystic Test Book of the Hindu Occult Chambers: Now Available!
This is one of the stranger works of the early 20th century. Written by the famous DeLaurence, it seeks to teach the reader how to use crystal gazing to contact spirits and help people with various issues, and to impart the secret of telepathy. It also covers the use of the seance to contact spirits, among other tricks within the spirit realm (while considering these spirits to be very much hermetic in form; that is, the sylphs, undines, etc.)
While some of the practices here are related predominantly to DeLaurence advertizing his own goods and services, it is true that some of them remain in use, and are of occult interest to this day.