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Measurements are presented of the magnetization of mild steel, at field strengths between 100 A/m and 1200 A/m, for hysteretic and anhysteretic conditions. Magnetization was parallel or perpendicular to an applied uniaxial stress. The experimental results showed that tension parallel to the field or compression perpendicular to the field had relatively little effect on the flux density, but parallel compression or perpendicular tension reduced the flux density considerably. The theory presented predicts this symmetry, but it cannot account for other features of the measurements.