After the post-mortem examination on the body of Mr. Cook some portion was sent up to me. I experimented to ascertain if there were any poison present. We sought for prussic acid, oxalic acid, morphia, strychnia, veratrea, a poison of white hellebore, the poison of tobacco, hemlock, arsenic, mercury, antimony, and other mineral poisons generally. We only found small traces of antimony. The part which we had to operate upon was in the most unfavourable condition for finding strychnia if it had been there. The stomach had been completely cut from end to end; all the contents were gone, and the fine mucous surface, on which any poison if present would be found, was lying in contact with the outside of the intestines, all thrown together. There was also succulent matter on the surface of the mucous membrane, derived from the intestines, the contents of which partly escaped. The inside of the stomach had been forced into this mass of intestinal succulent matter; at any rate, it was lying so. In journeying up to London it must have been shaken in every possible way. The contents of the intestines were there, but the contents of the stomach were gone. If there had been any of this poison present I should have expected to have found it in the contents of the stomach and on the mucous membrane. At my request other portions of the body were sent--the liver, the spleen, and the two kidneys; in addition, a small bottle of blood, unlabelled, giving us no idea whence it was taken. We analysed all those portions. We searched for mineral poison in the liver and kidneys, and discovered antimony in an eighth part of the liver; we analysed only the left kidney and the spleen, and there were traces of antimony in each. The quantity was less in proportion in the spleen than in the other parts. The blood contained antimony. Would its being found in the blood enable you to form any opinion how shortly before death the antimony had been given?--It is impossible to say with any precision, but I should say shortly before death--within some days; the longest period known at which antimony has been found in the blood, after a person has ceased to take it, was eight days. I heard the account by the servant girls of the vomiting of Mr. Cook; I also heard the account given of his vomiting at Shrewsbury, and by the medical men, Gibson and Jones, and Dr. Bamford’s deposition as to the concomitant symptoms. In my opinion, the vomiting would be such as might be produced by antimony. Tartar emetic is soluble in fluids, and if mixed with broth or toast and water would not affect the colour.