“…These may be broadly classified as: (i) Basal sedation. A wide variety of drug combinations have been used (Smith, I950;Rees and Hay, I959;Fieldman et al, I955;Keown et al, 1957;Smith, Rowe, and Vlad, 1958;Carnegie, I953;Feldman, Robbie, and Monro, I96I;Ordish and Mair, I96I).…”