And now having to deal with what I define as messages conveyed by one stratum in man to another stratum, I must first consider in what general ways human messages can be conveyed. Writing and speech have become predominant in the intercourse of civilised men, and it is to writing and speech that we look with most interest among the communications of the subliminal self. But it does not follow that the subliminal self will always have such complex methods at its command. We have seen already that it often finds it hard to manage the delicate co-ordinations of muscular movement required for writing,--that the attempt at automatic script ends in a thump and a scrawl. The subliminal self like the telegraphist begins its effort with full knowledge, indeed, of the alphabet, but with only weak and rude command over our muscular adjustments. It is therefore _a priori_ likely that its easiest mode of communication will be through a repetition of simple movements, so arranged as to correspond to letters of the alphabet. And here, I think, we have attained to a conception of the mysterious and much-derided phenomenon of "table-tilting" which enables us to correlate it with known phenomena, and to start at least from an intelligible basis, and on a definite line of inquiry. A few words are needed to explain what are the verifiable phenomena, and the less verifiable hypotheses, connoted by such words as "table-turning," "spirit-rapping," and the like. If one or more persons of a special type--at present definable only by the question-begging and barbarous term "mediumistic"--remain quietly for some time with hands in contact with some easily movable object, and desiring its movement, that object will sometimes begin to move. If, further, they desire it to indicate letters of the alphabet by its movements,--as by tilting once for _a_, twice for _b_, etc., it will often do so, and answers unexpected by any one present will be obtained. Thus far, whatever our interpretation, we are in the region of easily reproducible facts, which many of my readers may confirm for themselves if they please.