To say that all the visible inhabitants of the mundane spirit-world are creatures of the disordered human liver, is perhaps a needless harshness of statement. The question of a future life is not involved in this subject, nor raised by the best writers who are studying it; but, religious belief quite apart, it remains to be proved that spirits of a supernatural world have any share in the affairs of a world governed by natural law. A goblin which manifests itself to the human eye, it seems to me, becomes natural, by bowing before the natural laws which rule in optics. Yet believers in ghosts find no difficulty in this direction; the word 'supernatural' covers a multitude of sins. 'What is the supernatural?' asks Disraeli, in 'Lothair.' 'Can there be anything more miraculous than the existence of man and the world? anything more literally supernatural than the origin of things?'