cf. C.A. 32, 9020.4. Tensile and fatigue data at 30° to 300° are given in many tables and graphs for 8 com. Mg alloys, containing varying percentages of Al, Zn, Mn, and Si, in the sand-cast, and extruded conditions, with and without thermal treatments. Cast and extruded alloys have approx. equal properties at the higher temperatures and extruded alloys are better at the lower temperatures Little difference was observed between sand-cast and chill-cast alloys. Coarse grain size was beneficial at elevated temperatures but not at lower temperatures