"There!" he cried. "Are they stamped or not? Is the signature written across the stamp or not?"

Lamberti had the advantage of knowing positively that when Guido had given the acknowledgments to his aunt, there had been no stamps on them. He did not know how they had got them now, but he was sure that some fraud had been committed. It was broad daylight still, and he examined the signature carefully while the lawyer held the half sheet of note paper before his eyes. The paper was certainly the Princess's, and the writing was Guido's beyond doubt. The Princess always used violet ink, and Guido had written with it. It struck Lamberti suddenly that it had turned black where the signature crossed the stamp, but had remained violet everywhere else. Now violet ink sometimes turns black altogether, but it does not change colour in parts. As he looked nearer, he saw that the letters formed on the stamp were a little tremulous. Though he had never heard of such a thing, it now occurred to him that the stamp had been simply stuck upon the middle of the signature, and that the part of the latter that had been covered by it had been cleverly forged over it.

"The stamp makes very much less difference in law than you seem to suppose," said the lawyer, enjoying his triumph.

"It will make a considerable difference in law," answered Lamberti, "if I prove to you that the stamp was put on over the first writing, and part of the signature forged upon it. It has not even been done with the same ink! The one is black and the other is violet. Do you know that this is forgery, and that you may lose your reputation if you try to found an action at law upon a forged document?"

The lawyer was now scrutinising the signatures of the notes one by one in the strong evening light. His anger had disappeared and there were drops of perspiration on his forehead.

"There is only one way of proving it to you," Lamberti said quietly. "Moisten one of the stamps and raise it. If the signature runs underneath it in violet ink, I am right, and the wisest thing you can do is to hand me those pieces of paper and say nothing more about them. You can write to Monsieur Leroy that you have done so. I even believe that he would pay a considerable sum for them."

It was as he said, and the lawyer was soon convinced that he had been imposed upon, and had narrowly escaped being laughed at as a dupe, or prosecuted as a party accessory to a fraud. He was glad to be out of the whole affair so easily. Therefore, when Lamberti reached his friend's door, he had the receipts in his pocket and he now meant to tell Guido what had happened, after first giving them back to him. Guido would laugh at Monsieur Leroy's stupid attempt to hurt him. But some one had been before Lamberti.

"He is very ill," said the servant, gravely, as he admitted him. "The doctor is there and has sent for a nurse. I telephoned for him."

Lamberti asked him what had happened, fearing the truth. Guido had felt a little better in the afternoon and had asked for his letters and papers. Half an hour later his servant had gone in with his tea and had found him raving in delirium. That was all, but Lamberti knew what it meant. Guido did not take the Figaro, but some one had sent the article to him and he had read it. He had brain fever, and Lamberti was not surprised, for he had suffered as much on that day as would have killed some men, and might have driven some men mad.

Lamberti did not wish to frighten Cecilia or her mother, but he sent them word that he would not leave Guido that night, nor till he was better, and that he had seen the lawyer and had recovered a number of forged papers.