Born in Fleet Street, London on 21 September 1858, the fourth child and second son of Archibald Day, actuary to the Prudential Assurance Company, and Emily Thompson, his wife. He was educated at the Royal Grammar School, Guildford, and at St Bartholomew's Hospital. He soon showed skill in dissection, and was selected to act as prosector at the Royal College of Surgeons of England in 1879. At St Bartholomew's Hospital he was senior scholar in 1879 and Lawrence scholar in 1880, and at the University of London he won the gold medal in surgery in the same year. The family of Day had long been connected with Norwich, and Donald Day proceeded at once to Norwich instead of applying for a house surgeoncy at St Bartholomew's Hospital, to which he was fully entitled. At Norwich he was appointed house surgeon to the Norfolk and Norwich Hospital in 1880, joined his uncle Dr William H Day in practice in the city, was appointed assistant surgeon to the Norfolk and Norwich Hospital in 1890, and was surgeon from 1901 until his retirement in 1923. He married Henrietta Sarah Blaxland on 11 August 1888. She survived him with five sons and three daughters. Of this family two entered the medical profession: George Day, MRCS and Mrs Mary Thackwell, MB. He died at Harleston on 20 December 1937, and was buried at Redenhall, Norfolk. Donald Day was an influence for good at Norwich. He might have made a name for himself in London, but he chose to spend his life in Norwich, where he had a family tradition of more than a hundred years. As a surgeon he had exceptional manual dexterity; as a man he was somewhat shy and hid his feelings behind a casual manner; as a sportsman he was an excellent skater, a keen and accomplished fisherman. Throughout his life he was a devout churchman, and for some time he was a member of the Norwich Diocesan Conference. Publications:- Notes on a case of enterectomy for gangrenous intestine in which the button of Murphy of Chicago was successfully employed. *Brit med J*. 1895, 1, 850. Case of hairball in the stomach. *Ibid*. 1902, 2, 1899. A case of nephro-lithotomy; large calculus. *Trans Clin Soc Lond*. 1893, 26, 24.