This is not very consistent or helpful counsel. Like the rest of us, who are so far beneath M. Littre in grasp and in weight of authority, he was subject to the idola fori, the illusions of the market-place. It would never do for a great scientific sceptic to say, 'Here are strange and important facts of human nature, let us examine them as we do all other natural phenomena,' it would never do for such a man to say that without qualification. So he concluded his essay in the pooh-pooh tone of voice. He first gives a sketch of abnormalities in mortal experience, as in the case of mental epidemics, of witchcraft, of the so-called prophets in the Cevennes, of the Jansenist marvels. He mentions a nunnery where, 'in the sixteenth century,' there occurred, among other phenomena, movements of inanimate objects, pottery specially distinguishing itself, as in the famous 'Stockwell mystery'. Unluckily he supplies no references for these adventures.' {57} The Revue, being written for men and women of the world, may discuss such topics, but need not offer exact citations. M. Littre, on the strength of his historical sketch, decides, most correctly, that there is rien de nouveau, nothing new, in the spirit-rapping epidemic. 'These maladies never desert our race.' But this fact hardly explains _why_ 'vessels were dragged from the hands' of his nuns in the sixteenth century. In search of a cause, he turns to hallucinations. In certain or uncertain physical conditions, the mind can project and objectify, its own creations. Thus Gleditch saw the dead Maupertuis, with perfect distinctness, in the salle of the Academy at Berlin. Had he not known that Maupertuis was dead, he could have sworn to his presence (p. 866). Yes: but how does that explain volatile pots and pans? Well, there are _collective_ hallucinations, as when the persecuted in the Cevennes, like the Covenanters, heard non-existent psalmody. And all witches told much the same tale; apparently because they were collectively hallucinated. Then were the spectators of the agile crockery collectively hallucinated? M. Littre does not say so explicitly, though this is a conceivable theory. He alleges after all his scientific statements about sensory troubles, that 'the whole chapter, a chapter most deserving of study, which contains the series of demoniac affections (affections demoniaques), has hardly been sketched out'.