The classic guide for all who entertain a genuine determination to understand the spirit world—both mediums and seekers—from the founder of Spiritism. Covering all aspects of Spiritism—from haunted places to pneumatography, somnambulic mediums and healing mediums to mediumship in animals—this all-encompassing reference gives advice to those looking to hone their talents and a way to root out charlatans and frauds for those seeking a go-between to the other side.The Book on Mediums features: The special instruction of the spirits on the theory of all kinds of manifestations The means of communicating with the invisible world The development of mediumship The difficulties and the dangers that are to be encountered in the practice of Spiritism