39. Experimental Spiritism has studied the properties of spiritual fluids, and their action upon matter. It has demonstrated the existence of a fluidic body, in which the ancients had a partial belief, designated by St. Paul under the name of “spiritual body;” that is to say, the gaseous body of the soul, which remains after the destruction of the material body. It is known today that this envelope is inseparable from the soul; that it is one of the constituent elements of a human being; that it is the vehicle for the transmission of thought; and that during earthly life it serves as a connection between spirit and matter. This spiritual body or perispirit, plays such an important part in the organism and in a multitude of productions, that there needs to be allied to physiology and psychology.