In The Varieties of Religious Experience the late Professor William James has said (p. 465): 'The religious phenomenon, studied as an inner fact, and apart from ecclesiastical or theological complications, has shown itself to consist everywhere, and at all its stages, in the consciousness which individuals have of an intercourse between themselves and higher powers with which they feel themselves to be related. This intercourse is realised at the time as being both active and mutual.' The book now before the reader deals with the religious phenomenon, studied as an inner fact, in the earlier stages of religion. By 'the Idea of God' may be.