Who does not remember the story of the Christian missionary in Britain, sitting one evening in the vast hall of a Saxon king, surrounded by his thanes, having come thither to preach the gospel of his Master; and as he spoke of life and death and immortality, a bird flew in through an unglazed window, circled the hall in its flight, and flew out once more into the darkness of the night. The Christian priest bade the king see in the flight of the bird...