“…THE importance of assessing the acid-base state of foetal blood as a guide to hypoxia during labour has been stressed by several authors (Saling, 1963(Saling, , 1964(Saling, , 1965Huntingford, 1964;Kubli and Berg, 1965;Morris and Beard, 1965). In the original technique, which was introduced by Saling (1963), a few drops of foetal blood were aspirated from a small incision in the foetal scalp into a length of transparent polyvinyl chloride tubing of 1 mm.…”