Day was born on 4 August 1815 at
Tenby,
Pembrokeshire. He was the son of George Day of Manorabon House,
Swansea; his father had inherited the fortunes of his own father, George Day, physician to the
Nawab of Arcot, and his uncle, Sir John Day, solicitor-general in Bengal. His mother was Mary Hale. After his father's ruin by the failure of a bank in 1826, he was brought up by his grandmother, Mrs. Hale. Day entered
Trinity College, Cambridge, in 1833, and after one term obtained a scholarship at
Pembroke College where he graduated in 1837. He studied medicine in Edinburgh, where he obtained several medals. He took his M.A. degree at Cambridge in 1840. In 1843 Day began practice in London, becoming a member of the
Royal College of Physicians in 1844, and a fellow in 1847. He was physician to the
Western General Dispensary, and lecturer on
materia medica at
Middlesex Hospital. In 1849 he became
Chandos Professor of Anatomy and Medicine at the
University of St Andrews, and obtained the M.D. degree from the
University of Giessen. He carried out reforms in the M.D. examination. He had been elected
Fellow of the Royal Society in 1850, and was a member of other learned societies. Day broke his arm in an accident on
Helvellyn in 1857, and never recovered. In 1863 changes were made in St Andrews by an act of parliament, and Day retired on a pension. He settled at
Torquay for his health, but became a permanent invalid. Day died on 31 January 1872. ==Works==