As an intermediary between the origin of the substance with the substance is what led Bailey to a handful of sources from the recipients of the substance to achieve any effect, according to the purpose of the communication.
As an intermediary between the source of the substance to the audience. Is the lead compound from its source to the receiver. To achieve any results For the purposes of communication
As an intermediary between the sources and receivers. What led message from the source to the receiver to cause the operation any effect by objective means of communication.