Born at Perth on November 2nd, 1810, the only son of the leading partner of the well-known firm of Duncan, Flockart and Company, chemists. He was educated at Perth, at the High School, Edinburgh, and at the University of Edinburgh, where he acted first as House Physician under Gregory, and then as House Surgeon under Liston. He also, after 1885, travelled on the Continent and visited the schools of France, Germany, Austria, and Italy. Following Robert Liston, his master, to London, he acted as his House Surgeon in University College Hospital. In 1887 he settled in practice in Edinburgh, and rose rapidly to eminence. He was for many years Surgeon to the Royal Infirmary, was twice re-elected to this office, and was Consulting Surgeon to the institution at the time of his death, as well as one of the managers. When Senior Surgeon to the Infirmary he delivered lectures on Clinical Surgery. At the time of his death he was also Consulting Surgeon to the New Town Dispensary and to the Eye Dispensary, and Medical Officer to the Scottish Provident Institution. He practised at 12 Heriot Row, Edinburgh, and had latterly the largest general practice in the city. During 1866 the increase of his practice was such as to exhaust his strength, and accordingly with the view of relaxation he went with his wife and family, at the end of July, to the Continent, leaving his son to take charge of his practice in his absence. Cholera was prevalent in Paris; Duncan developed symptoms of the disease and died on August 16th, 1866. He was a kind, genial, domesticated man, with a keen sense of humour in conversation. Among his Edinburgh contemporaries were James Duncan, of Henderson Row, and the well-known James Matthews Duncan, the obstetrician, neither of whom was related to him. Publications:- *On Foreign Bodies in the Air-passages*, 8vo, Edinburgh, 1835. "Neuralgia of Stump after Amputation; Secondary Amputation; Return of the Neuralgia," 8vo, Edinburgh, 1844; reprinted from *North. Jour. Med. Edin.*, 1844. "Case of Carotid Aneurism," 8vo, plate, Edinburgh, 1844; reprinted from *Edin. Med. and Surg. Jour.*, 1844. "Surgical Cases," 8vo, Edinburgh, 1845; reprinted from *North. Jour. Med. Edin*. *Case of Fatal Haemorrhage from the Perforation of the Aorta by False Teeth impacted in the Oesophagus*, 8vo, plate, Edinburgh. "Case of Fibrous Tumour surrounding the Right Sciatic Nerve," 8vo, Edinburgh, 1841; reprinted from *London and Edin. Jour. Med. Sci.*, 1841. "Surgical Cases. Strangulated Femoral Hernia: Gangrene: Death," 8vo, Edinburgh, 1844; reprinted from *North. Jour. Med. Edin*. *Surgical Cases. Removal of a Coin from the Larynx by Inversion of the Body*, 8vo, Edinburgh, 1845.