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The first and second dissociation constants of adrenaline, noradrenaline, 3-amino-l-plienylethanol, and catechol have been determined in aqueous solution a t 25" by means of a glass electrode. The further ionisation of adrenaline and of noradrenaline in aqueous solution is considered, and the interference that arises in quantitative work from the oxidation of these compounds to adrenochrome and melanin-like compounds is discussed.ALTHOUGH the chemical and pharmacological properties of adrenaline and noradrenaline have been extensively studied (see, e.g. , ref. 1, and references therein) , their properties as metal-complexing agents, although mentionedJ2s3 do not appear to have been studied in detail. This is in part due to the readily oxidisable nature of adrenalineJ4 and, in fact, it

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