Evidence is adduced indicating that geomagnetic disturbance at Huancayo isnormal, that is, comparable with that shown elsewhere in similar latitudes —as contrasted with the remarkable Huancayoabnormality, in the horizontal magnetic force, of the quiet-day solar and lunar daily variations, and in theS q augmentation (solar flare effect). the normality of magnetic disturbance at Huancayo is manifested by the disturbance daily variationS D, and by the storm-effectD st and its associated changes of daily mean (D m) and the non-cyclic variation; it is not stated whether or not the irregular part,D i, is normal. The normality ofD st seems natural according to theChapman-Ferraro theory of magnetic storms, but the normality ofS D is less easy to explain.