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is a very large class of persons alive to-day who believe that not only is communication with the dead possible, but that they themselves have had actual experience of it. Many of these are eminent in scientific research, and on any other subject the world in general would accept their evidence.

There is possibly a larger class of persons who hold that all such communications, if genuine, come not from the dead but from the devil. This is the taught opinion of the Roman Catholic Church.

A third class, far more numerous than both of these, is sure that any one who holds either of these beliefs is a dupe of conjurers, or the victim of his own disordered brain. This type of robust intellect has, during the last ten decades, affirmed that hypnotism, aviation in machines heavier than air, telepathy, wireless telegraphy, and other non-proved phenomena, are superstitious and unscientific balderdash. In an earlier century it was equally certain that the earth did not go round the sun. It is, happily, never disconcerted by the frequency with which the superstitions and impossibilities of one generation become the science of the next.

The first part of this book may be accepted by the