together with short communications from members to In 1972 the 10th Annual Symposium of the Society for the provide a valuable overview of the current status of this Study ofInborn Errors of Metabolism was held in Cardiff field. The difficulty in establishing an uneq uivocal clinical and the proceedings published in 1973. The meeting was devoted to the treatment of inborn errors of metabolism; response to vitamin treatment was discussed by Dr in particular the dietary treatment of phenylketonuria Leonard. The papers on biotin-responsive combined and vitamin responsive disorders were reviewed....