At the ZnO/aqueous electrolyte solution interface, three processes occur on changing the pH of the medium: (a) adsorption of H ÷ or OH-; (b) dissolution or precipitation of ZnO; (c) a slow process consuming H + or OH-, A technique is described by which these processes can be separated. When due allowance is made for the slow process and when the influence of changes in solubility is eliminated, the capacity due to adsorption of H ÷ or OH-alone can be calculated: it is significantly smaller than that found by titration, and smaller than that of the diffuse double layer. The Stern capacity is comparable to that found at AgI/aqueous electrolyte solution interfaces near the pzc.

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The induction and maintenance of anaesthesia with ether using a combined intravenous infusion and a constant low inspired concentration are discribed. Predictions from a mathematical model were checked against animal experiments. Anaesthesia occurred within 5 min. The mehtod obviates the need for explosive mixtures.

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