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2 described a new enzyme present in red blood corpuscles which catalyses both phases of the reversible reaction: H2CO3, CO2 + H20. They purified this enzyme from mam- malian erythrocytes and gave a detailed account of its properties and the kinetics of the reactions which it catalyses. The greatly purified enzyme preparation obtained by them had a very high catalytic activity, was a colourless substance free from haematin and from other known enzymes, stable within pH 3-12, thermolabile, and very sensitive to KCN, H2S, NaN3 and to several heavy metals.
Keilin et al. (1940) studied this question.