"I am a medical man; and in my early manhood, I practised in the village of Damington. I was present at the birth of Edward Fielding, and of Gregory Fellenger. I know about the mark on the arm of the real heir. Madaline changed the two children, and I said nothing as she promised to marry me. I was madly in love with her. She left the village, and deceived me. Afterwards I held my tongue lest I should get into trouble; also I hoped when the false Sir Gregory grew up, to have a hold on him. I was prevented from doing this by Madaline (whom I had discovered in Tooley's Alley, under the name of Mrs. Boazoph). She threatened to reveal the name of the true heir if I meddled with her son. I therefore did nothing. I saw the poisoned needle which Louis had made ready for an experiment. It was in a cabinet in the laboratory. Young Vaud came to Taxton-on-Thames nearly crazed with the death of Emma Colmer, whom he had courted as Emma Calvert. She had been driven to her death by her husband, the false Sir Gregory, and had killed herself in Paris. Vaud asked me about poisons. He said nothing to me about killing Sir Gregory, or I should have dissuaded him from doing so wicked and rash an action. "I swear I did not wish the death of the young man. What I said to him in the laboratory, was purely without ulterior motives. "I admit I showed him the poisoned needle. I was interested in the experiment, and, being full of it, I spoke of our intention of trying the poison on the dog. When Vaud left the laboratory, I did not miss the needle; I did not miss it until Louis spoke to me about it. As Turnor had lately been in the laboratory, and we had been speaking about the experiment, I thought he had taken the needle. It never struck me that Vaud had benefited by my explanation, and had stolen the needle to kill Gregory. With Louis I went up to town on the twenty-first of June, to see Turnor, and ask him for the needle; I had no motive in taking Louis to Turnor's. If Turnor attempted to blackmail Louis, I knew nothing about it. I repel with scorn the insinuation that I purposely inveigled Louis to Great Auk Street to entangle him in the crime, and so blackmail him. I never heard of the murder until I went to the Red Star, according to my usual custom of an evening. Madaline asked me if I had seen Vaud, who was disguised as a negro. I said I had not.