At a recent meeting of the Royal Society of England J. A. Flemming and R. Hadfield gave the results of some of their investigations on the magnetic properties of alloys. They have found that an alloy composed of manganese 22.4 per cent, copper 60.5 per cent, carbon 1.5 per cent, silicon 6.37 per cent aluminum 11.05 per cent and iron 0.21 per cent, has magnetic properties which are identical with those of materials which are naturally feebly magnetic and that the permeability is between 28 and 20, which is not much inferior to the values reached for a low grade of cast iron for small magnetic forces. The alloy can also be permanently magnetized. This leads to the surmise that the magnetic properties of the alloy result from a similarity of molecular structure to that of the ordinary magnetic materials, such as iron, nickel and cobalt, and that, if the proper molecular arrangement can be found in an alloy, it may be possible to construct a material which is quite as magnetic as iron, and possibly even more so.