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at any time. The date: March 22, 1877. Leverrier gave the name "Vulcan" to the object that Dr. Lescarbault had reported. By the same means by which he is, even to this day, supposed--by the faithful--to have discovered Neptune, he had already announced the probable existence of an Intra-Mercurial body, or group of bodies. He had five observations besides Lescarbault's upon something that had been seen to cross the sun. In accordance with the mathematical hypnoses of his era, he studied these six transits. Out of them he computed elements giving "Vulcan" a period of about 20 days, or a formula for heliocentric longitude But he placed the time of best observation away up in 1877. But even so, or considering that he still had probably a good many years to live, it may strike one that he was a little rash--that is if one has not gone very deep into the study of hypnoses--that, having "discovered" Neptune by a method which, in our acceptance, had no more to recommend it than had once equally well-thought-of methods of witch-finding, he should not have taken such chances: that if he was right as to Neptune, but should be wrong as to "Vulcan," his average would be away below that of most fortune-tellers, who could scarcely hope to do business upon a fifty per cent. basis--all that the reasoning of a tyro in hypnoses. The scientific world was up on its hind legs nosing the sky. The thing had been done so authoritatively. Never a pope had said a thing with more of the seeming of finality. If six observations correlated, what more could be asked? The Editor of Nature, a week before the predicted event, though cautious, said that it is difficult to explain how six observers, unknown to one another, could have data that could be formulated, if they were not related phenomena. In a way, at this point occurs the crisis of our whole book.