Another important branch of Dr. Jenner’s inquiry dealt with the question as to whether the specific cause of these diseases is distinct or the same, the latter being then the preponderant opinion. In a paper on this subject communicated to the Royal Medical and Chirurgical Society, on December 11, 1849, he showed that in 1847-8-9, on analysing all the cases in which two or more fever patients came from the same house, scarcely a single instance occurred where typhus and typhoid came at the same period from the same house. In nearly all cases the two diseases came from quite distinct localities. No transitional cases occurred between the two; the rash of typhoid did not graduate into that of typhus. It was several times observed that when a succession of cases came from the same locality, or arose apparently from the same cause, they agreed remarkably in symptoms or other features. Thus Dr. Jenner considered he had definitely proved that typhus and typhoid proceeded from perfectly distinct causes, a result which recent medical science accepts without reserve. Although the contributions of this distinguished physician have been of such high worth, and his subsequent success so great in practice, he is far from being wedded to the view that any great step forward in medicine has been the direct result of the labours of a single man. Long after his early papers, in addressing the British Medical Association in 1869, Sir William Jenner said: “The silent workers render most efficient aid, the results of their unspoken experience confirming or refuting the published assertions of the few.” He believes that no science has advanced more during the present epoch than medicine, and that it has progressed equally as a practical art. Dr. Jenner’s appointments include, among a crowd of others, those of Physician to University College Hospital (1854), Professor of Clinical Medicine (1857) and of the Principles and Practice of Medicine (1862), Physician to the Hospital for Sick Children (1852), Assistant-Physician to the Fever Hospital (1853). In 1864 he was elected Fellow of the Royal Society, and became President of the College of Physicians in 1881. In 1861 he was appointed Physician-Extraordinary to the Queen, and attended the Prince-Consort in his last illness. In 1862 he became Physician-in-Ordinary to the Queen, and has frequently attended her Majesty. He was made a baronet in 1868, and further advanced to the dignity of a K.C.B. in 1872 for his services during the Prince of Wales’s illness from typhoid fever.