At the end of the winter session of 1849 Dr. Williams resigned his professorship and physiciancy, his health having severely suffered from overwork, and private practice increasing rapidly. He removed to Upper Brook Street, and here continued for twenty-four years in full practice. In January 1849 Dr. Williams published his first account in the _London Journal of Medicine_, on Cod-Liver Oil in Pulmonary Consumption. He had been studying its application for three years, but of course the priority in recommending it belongs to Dr. Hughes Bennett. It was only in 1846, when a purified oil had been prepared from the fresh livers of the fish, that Dr. Williams found patients willing to take the oil, and in 1848 he wrote that he had prescribed the oil in 400 cases of tubercular disease of the lungs, and in 206 out of 234 recorded cases its use was followed by marked improvement. The administration of cod-liver oil is such a commonplace of the present day that it can scarcely be realised that it is a novelty almost exclusively belonging to the present half of the nineteenth century. And to Dr. Williams very much of the credit, and of the proof of its efficacy, is due. A lady first visited on September 3, 1847, appeared at the verge of death. Cod-liver oil restored her in a few weeks, and she lived many years after. This was a sample of the experience which, after many years’ testing, led Dr. Williams to say, in the great work on pulmonary consumption published by himself and his son, Dr. C. T. Williams, in 1871, that the average duration of life in phthisis had been at least quadrupled. Of 1000 cases tabulated, 802 were still living at the last report, and many were expected to live for years. The New Sydenham Society, started in 1858, also found an apt first president in Dr. Williams. Its usefulness in improving medical literature by translations and republications has been and is very great. The Lumleian Lectures at the College of Physicians followed in 1862, and were entitled “Successes and Failures in Medicine.” They were not published till 1871, when they appeared in the _Medical Times and Gazette_. Great attention was directed in them to the hopes and prospects of prevention of disease. In 1873 Dr. Williams was elected to the Presidency of the Royal Medical and Chirurgical Society, which he held for two years, though suffering from gradually increasing deafness. In 1874 he was appointed Physician-Extraordinary to the Queen. In 1875 he retired to Cannes, where he has since renewed his earlier astronomical studies, and made some important observations on sun spots. So in scientific recreations, and in Biblical studies in which he has long been deeply interested, the veteran physician whom Dr. Quain describes as “the principal founder of our modern school of pathology,” passes the closing years of a protracted life. * * * * *