“…The statistics published during the past decade from 12 centres in America (Hays et al, 1960;Kellogg and Bill, 1961;Swenson and Oeconomopoulos, 1962;Benson, Lloyd, and Fischer, 1963;Peck, Lynn, andDuShane, 1963), Britain (Dennison andShaker, 1970;Suita, 1970;Hood, 1967), Scandinavia (Hansen and Pedersen, 1968), and Australia (Wright, 1963;Nelson, 1960;Auldist, 1970) compared with the present figures from South Africa show in many respects fair similarity. The numbers admitted per annum to various centres differ widely, but without accurate incidence figures interpretation is difficult.…”