I wish now to detail as briefly as sible, and yet with some clearness, a considerable number of typical cases. My purpose in this is to place the intelligent reader in such a position that he may be able to make up his own mind as to what theory seems best fitted to account for the facts. The two theories which at present are rivals in the field will be and dealt with after the cases are outlined.
I prefer to deal chiefly with such occurrences as I have been personally familiar with. Almost all of them find their parallels in the published Proceedings of the Society for Psychical Research; but in detailing cases which I have personally known there are two advantages. First, they are, of course, fresher and more vivid in my recollection; and, secondly, they will serve the purpose of reinforcing and confirming the observations and experi ences of others which have been already published.