Only Durham, London and the Queen's University of Ireland were recognised as universities at the time of their foundation, granting their first degrees in 1837, 1839 and 1851 respectively. Durham was a collegiate university, London was an examining board, and the Queen's University was a federal university. The other institutions, while teaching at university level, were colleges, some becoming universities later. In addition, many other universities trace their roots to institutions founded in this period, including the University of Strathclyde to the Andersonian Institute (1796), Heriot-Watt University to the School of Arts of Edinburgh (1821), Birkbeck, University of London to the London Mechanics' Institute (1823), and the University of Manchester (via UMIST) to the Manchester Mechanics Institute (1824). Many medical schools also date from the 18th century or earlier, including St Thomas's Hospital Medical School (now part of King's College London) between 1693 and 1709, St George's, University of London in 1733, Middlesex Hospital Medical School (now part of University College London) in 1746, London Hospital Medical College (now part of Queen Mary, University of London) in 1786.