Aconitase, an enzyme widely distributed i living organisms, was first found in higher plants (kidney beans, cucumber seeds) by Martius (1939), and was later shown to occur in leaves of cabbage (Jacobsohn & Soares, 1940) and of rhubarb (Morrison & Still, 1947). Studies by Dickman & Cloutier (1951) and by Morrison (1954) have shown that during its purification from aniimal tissues the enzyme loses activity, which can be restored by the addition of ferrous iron together with cysteine, thioglycollate, aecorbate or glutathione. It has therefore been
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