The Munich Tertiary basin consists of a structural basin of Tertiary sediments. It is bounded on the east by the Bohemian crystalline massif; on the north by Mesozoic sediments which dip southward under it; and on the south, it has been overridden by the Alpine overthrusts. The whole Bavarian part of the basin has been covered by a close net of lines of observation of the vertical component of magnetism. Two torsion-balance lines were run north-south across the basin, and some additional cross lines were run. The geophysical survey indicates: (1) the surface of the crystalline basement dips southwestward across under the Tertiary basin; (2) the Bohemian crystalline massif seems to dip under the Austrian continuation of the Tertiary basin, to connect with the crystalline c re of the Austrian Alps; (3) the Bohemian massif seems to have a sharp subsurface scarp on the southward prolongation of the Regensburg fault; (4) the basement under the Tertiary sediments is not the crystalline basement, but presumably the surface of a wedge of Mesozoic rocks; (5) the crystalline core of the Vendelician ridge must be south of the present Munich Tertiary basin; (6) a line of hitherto unsurmised structures with basaltic cores lies along the Danube from Vohburg to Ulm; (7) the cause of most of the residual magnetic anomalies is not clear, but the Passau axis of the maximum seems to reflect structure with the basement; (8) no folding is indicated parallel with the front of the Alps.