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In the preceding paper (Dodgson & Powell, 1959) it was shown that an arylsulphatase present in the digestive juice and the digestive gland of the edible snail exhibited a shift in optimum pH as the concentration of substrate was increased. This paper describes the partial purification of the digestivegland enzyme and provides further evidence that the shift in optimum pH is not due to the presence of more than one arylsulphatase.

Studies on sulphatases. 27. The partial purification and properties of the arylsulphatase of the digestive gland of Helix pomatia