There have been a few cases in which members of the lodgeof occultists referred to above as originating the spiritualistic movement have themselves given, through a medium, a series of valuable teachings on deeply interesting subjects, but this has invariably been at strictly private family seances, not at public performances for which money has been paid. To understand the methods by which a large class of physical phenomena are produced, it is necessary' to have some comprehension of the various resources mentioned above, which a person functioning on the astral plane finds at his command; and this is a branch of the subject which it is by no means easy to make clear, especially as it is hedged about with certain obviously necessary restrictions. It may perhaps help us if we remember that the astral plane may be regarded as in many ways only an extension of the physical, and the idea that matter may assume the etheric state (in which, though intangible to us, it is yet purely physical) may serve to show us how the one melts into the other. In fact, in the Hindu