The chief object of this paper was to state the result of a careful analysis of the viscera of a mare, which had died after receiving daily, for six weeks or more, carbonate of lead in its food and drink. Portions of the lungs, the heart, the large intestine and its contents, the stomach and duodenum, the spleen, the kidney, and the liver, were subjected to analysis by the author, assisted by Mr Stevenson Macadam.