Referee's report by Alexander William Williamson, on two papers 'Research conducted for the medical department of the privy council at the pathological laboratory of St. Thomas's Hospital. First series.—The chemical nature and composition, combinations, and metamorphoses of the colouring-matters of bile' and 'Research conducted for the medical department of the privy council at the pathological laboratory of St. Thomas's Hospital regarding urine' by Johann Ludwig Wilhelm Thudichum Recommended for publication in the 'Philosophical Transactions of the Royal Society'. Subject: Physiology [Published in the 'Proceedings of the Royal Society of London'] Not recommended for publication in the 'Philosophical Transactions of the Royal Society'. Suggests the author not publish any experiments on this subject until more conclusive results have been obtained. Subject: Physiology [Not published] 13 May 1868