A method has been described for the estimation of blood levels of ether and halothane by gas chromatography using carbon tetrachloride as a solvent and chloroform as an internal standard. Reference has been made to the previous description of a similar method for the estimation of blood methoxyflurane levels and some technical improvements have been suggested. Extraction of both agents from blood was virtually complete and results were highly reproducible. * If x rng ether are added to 10 ml of solvent and 1 ml of this mixture is subsequently diluted to y ml, then the final concentration equals (10x)/y mg ether per cent.
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