The RCS and the Royal School of Mines subsequently merged in 1907 with the City and Guilds Central Technical College to form the Imperial College of Science and Technology, each continuing as a Constituent College of Imperial, which then joined the University of London in 1929. This administrative structure continued until 2002, surviving Imperial's mergers with a number of medical schools, which were formed into a fourth constituent college; and Imperial's merger in 2000 with Wye College, of which roughly one-fifth became designated as part of the Royal College of Science.