We are told that Leverrier "satisfied himself as to the substantial accuracy of the reported observation." The story of this investigation is told in _Monthly Notices_, 20-98. It seems too bad to threaten the naive little thing with our rude sophistications, but it is amusingly of the ingenuousness of the age from which present dogmas have survived. Lescarbault wrote to Leverrier. Leverrier hastened to Orgeres. But he was careful not to tell Lescarbault who he was. Went right in and "subjected Dr. Lescarbault to a very severe cross-examination"--just the way you or I may feel at liberty to go into anybody's home and be severe with people--"pressing him hard step by step"--just as anyone might go into someone else's house and press him hard, though unknown to the hard-pressed one. Not until he was satisfied, did Leverrier reveal his identity. I suppose Dr. Lescarbault expressed astonishment. I think there's something utopian about this: it's so unlike the stand-offishness of New York life. 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 at any time. 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 date: March 22, 1877. 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. Formulas are against us.