"No, there was no harm," Mr. Gryce reluctantly admitted. Caught in an absurdity amusing enough in its way, he would certainly under less strenuous circumstances have rather enjoyed his own humiliation. But the occasion was too serious and his part in it too pronounced for him to take any pleasure in this misadventure. In the prosecution of so daring a scheme for locating witnesses if not of discovering the actual user of the bow, it would not do to fail. He _must_ find the man he sought. If the Curator--but one glance into the room where that gentleman stood amid a litter of prints satisfied him that Sweetwater was right as to the impossibility of getting any information from this quarter. Nor could he hope, remembering what he had himself seen, that he would succeed any better with the last person now remaining on this floor--the young man busy with the coins in No. I. That he was to be so fortunate as to lay an immediate hand on the person who had shot the fatal arrow was no longer regarded by him as among the possibilities. Whoever this person was, he had found a way of escape which rendered him for the time being safe from discovery. But there was another possible miscalculation which he felt it his duty to recognize before he proceeded further in his difficult task. The bow found back of the tapestry had every appearance of being the one used for the delivery of the arrow. But was it? Might it not, in some strange and unaccountable way, have been flung there previous to the present event and by some hand no longer in the building? Such coincidences have been known, and while as a rule this old and experienced detective put little confidence in coincidences of any kind, he had but one thought in mind in approaching this final witness, which was to get from him some acknowledgment of having seen, on or about the time of the accident, a movement in the tapestry behind which this bow lay concealed. If once this fact could be established, there could be no further question as to the direct connection between the bow there found and the present crime. But Mr. Gryce might have spared his pains, so far as this young man was concerned. He had been so engrossed in his search for a particularly rare coin, that he had had no eyes for anything beyond. Besides, he was abnormally nearsighted, not being able, even with his glasses, to distinguish faces at any distance, much less a movement in a piece of tapestry. All of this was discouraging, even if anticipated; but there were still the people below, some one of whom might have seen what this man had not. He would go down to them now, but by a course which would incidentally enlighten him in regard to another matter about which he had some doubts.