The utter uselessness of accepting at its face value anyone's explanation of the nature of his subjective experience, is well shown by the once universal belief in witchcraft. If there is a single belief on behalf of which a mass of apparently unimpeachable evidence could be produced, it is this one. It has run its course throughout the whole world. It is still accepted by probably half the human race. In our own country eminent men, not alone theologians, but doctors, lawyers, statesmen, and men of letters, have given their solemn testimony in its favour. Thousands of people have been bewitched, and their symptoms described by thousands of others. More remarkable still, those accused have often enough confessed their guilt. Every possible corroboration has been given to this belief, and yet it is now scouted by educated persons all over the civilised world. Even religious teachers accept the explanation that these witchcraft cases were due to distinctly pathological conditions, and to the power of suggestion operating upon uninformed minds during an unenlightened age. But communications with spiritual beings rest on no better foundation than communication with Satan. Whether the alleged illumination be diabolic or angelic, the evidence for either, or both, is the same. The testimony of a man like the Rev. R. J. Campbell that he is conscious of a divine influence in his life is of no greater value than that of the medieval peasant who felt himself tormented by Satan. The one person is no better authority than is the other on such a topic. Both are the heirs of the ages, inheritors of a superstition that goes back to the most primitive ages of mankind, only modified in its expression by the culture of contemporary life.