“…Birch, H. G., Richardson, S. A., Baird, D., Horobin, G. and Illsley, R. (1970), for example, carried out a survey of subnormality in the community in the City of Aberdeen. Studies of hospital populations have been reported by Cross (1954), Conacher (19G9) and McKeown and Teruel (1970). Investigations which have attempted to include both types of population have been reported by Primrose (1966), Craft and Miles (1967) and Inne^ and Kidd (1967).…”