54. Mediums display a wide variety in their aptitudes, which render them more suitable or less so for obtaining this or that phenomenon, or this or that type of communication. According to such aptitudes, we may say that there are physical effects, intelligent communications, seeing, speaking, hearing, sensitive, drawing, polyglot, poetic, musical, writing, etc. mediums. A medium cannot expect what is outside his or her faculty. Without understanding the various mediumistic aptitudes, the observer cannot be informed about certain difficulties or impossibilities that may be encountered in the practice of mediumship.
