This volume completes the 'general' history of the county which was begun in 1911 in Middlesex II. It contains illustrated articles on the physique and pre-history of Middlesex, from Palaeolithic to Pagan Saxon times, on its religious houses and ecclesiastical organization, and on education within the county. It also includes a translation of the Middlesex section of Domesday Book with map, commentary, and index. The sequence of articles on education includes histories of working-class and private education, accounts of endowed schools, and a history of the University of London and its constituent colleges and schools.