[en] Paramagnetic susceptibility measurements have been made on α and β brasses containing ∼ 1 w/o Mn. The susceptibility varied with temperature according to the Curie Weiss law and the Curie constant and thereby the Bohr magneton number per Mn atom were determined. Interpreted in terms of valency, Mn monovalent in copper has a valency in α brass which decreases progressively with zinc content attaining the value 0.58 at the limiting of composition. Mn in β brass exhibits a valency 0.8. These results are not in keeping with previous values for the valency of manganese as determined from phase boundary relationships and electron to atom ratios