Studies of the stabilities of the metal complexes of acetohydroxarnic acid have been limited to those of iron(III) (1,6) and copper(II) (8) . The present investigation was undertaken in an attempt to establish the relative stabilities of the acetohydroxamate complexes of some divalent metal ions. Jannik Bjerrwn’s (2) well- known titration method seemed to be best suited for this study.