modern times as the coal fireplaces have been replaced with electric heating. The south and west ranges which complete the quadrangle were built in 1373–1378. They were built to provide more accommodation (on the ground floor) and to house the expanding college library (on the upper floor). The old part of the library is still there, and, still expanding, it also now occupies most of the ground floor as well (and other parts of the college). The large dormer windows were added as part of Warden Savile's rebuilding work which began in 1589. The origin of the name "Mob Quad" is obscure. On older plans and accounts the quad is called variously Little Quadrangle, Old Quadrangle, Bachelors' Quadrangle (that is, B.A. Fellows), Postmasters' Quadrangle, and Undergraduates' Quadrangle (at least after the construction of Fellows' Quadrangle). The word "mob", derived from the Latin mobile vulgus (the fickle crowd) does not appear in English until the late 17th century, and was not commonly used for Mob Quad until the end of the 18th century. It was possibly originally a humorous description of the occupants. The lawn is a 20th-century addition. See also Merton College, Oxford Merton College Library References Notes Merton College, Oxford Grade I listed buildings in Oxford Parks and open spaces in Oxford Courtyards Buildings and structures of the University of Oxford