Delbos had become thoughtful again. 'That would undoubtedly be the correct course,' said he, 'but it is a delicate matter, and we must not act too hastily.... Let us return for a moment to the illegal communication of that letter, which it will be so difficult for us to prove as long as we cannot induce Architect Jacquin to relieve his conscience. You remember Father Philibin's evidence--his vague allusion to a paper signed by your brother with a flourish, similar to that on the incriminating copy-slip--a paper about which he would give no precise information--being bound, said he, by confessional secrecy? Well, I am convinced that he was then alluding to the very letter which was placed in Judge Gragnon's hands at the last moment, for which reason, like you, I suspect it to be forged. But these are only suppositions, theories; and we need proofs. Now, if we drop that matter, and, for the time at all events, content ourselves with this duplicate copy of the writing slip, on which the school stamp appears, and on which the initialling is much plainer, we still find ourselves face to face with some puzzling, obscure points. Without lingering too much over the question how it happened that such a slip was in the Brother's pocket at the moment of the crime--a point which it is rather difficult to explain--I am very worried by the disappearance of the corner on which the school stamp must have been impressed; and I should like to find that corner before acting, for I can foresee all sorts of objections which will be raised in opposition to us, in order to throw the affair into a muddle.' Marc looked at him in astonishment. 'What! find that corner? It would be a wonderful chance if we should do so! We even admitted that it might have been torn away by the victim's teeth.' 'Oh! that is not credible,' Delbos answered. 'Besides, in that case the fragment would have been found on the floor. Nothing was found, so the corner was intentionally torn off. Besides, we here detect the intervention of Father Philibin, for, as you have told me, your assistant Mignot remembers that at his first glance the copy-slip appeared to him to be intact, and that he felt surprised when, after losing sight of it for a moment, he saw it still in Father Philibin's hands and mutilated. So there is no doubt on the point; the corner was torn away by Father Philibin. Throughout the campaign it was he, always he who turned up at decisive moments to save the culprit! And this is why I should like to have complete proof--that is to say, the little fragment of paper which he carried away with him.' At this David in his turn expressed his surprise: 'You think that he kept it?'