“…In Sheffield, however, the ratio of boys to girls is only 1-05 to 1 (Registrar-General, 1951), so that this can only account for a small fraction of the preponderance of boys with head injuries. Others have reported a similar sex incidence (Beekman, 1928;Ireland, 1932;Fabian and Bender, 1947;Rowbotham, Maciver, Dickson and Bousfield, 1954;Harris, 1957).…”