Dr. Lamson had also brought with him some sweets and a cake, and he gave slices of this to the schoolmaster and to his young brother-in-law, and also ate a piece himself. Immediately after the lad had swallowed the capsule Lamson observed: "That's soon gone, my boy," and then remarked, "I must be going now." He then left with the intention of catching the evening boat-train to Paris. Very shortly afterwards Percy became ill and told the schoolmaster that he felt exactly as he did four months before when his brother-in-law had given him a pill. Doctors were summoned, but in spite of everything that was done the poor boy died the same evening. A medical examination of the body showed no appearance of any disease that could have resulted in such sudden death, but a chemical examination of the stomach, which was made by Dr. Stevenson and Dr. Dupré, proved that a vegetable irritant poison must have been the cause of death. Investigations showed that on several occasions Dr. Lamson had purchased small quantities of aconitine from different chemists, and this strengthened the suspicions already attaching to him. A few days later Lamson returned from Paris and voluntarily went to Scotland Yard, saying that as his name had been mentioned in connection with the case he had thought it best to call and see what was to be done about it. He was then arrested and formally charged with causing the death. The trial was memorable for the conclusive nature of the scientific evidence. The cake and sweets had been analysed and found to be quite free from aconite and the gelatine capsules were also proved to be innocuous. At the bottom of the boy's box a pill-box had been discovered containing pills in which aconitine was present, but although the point was suggested by the defence, there was no evidence to show that the boy had secretly taken one of these. The presence of morphia and aconitine in the body was proved, the latter being identified by its general chemical reactions as an alkaloid, by the burning sensation produced upon the tongue, and by its characteristic action upon mice, as compared with that of a standard solution of pure aconitine. In each case the animals died, the symptoms being the same and characteristic of aconitine poisoning.