In a preliminary note communicated last July, I drew attention to what seemed a novel property of iron wire under the combined influence of circular and longitudinal magnetisations. Similar experiments were subsequently tried with nickel, and similar results obtained. It appeared, however, that in some respects nickel behaved oppositely to iron. The first series of observations brought out the fact that a current along the nickel wire seemed to assist the acquiring, under a longitudinal magnetising force, of a polarity oppositely directed to the direction of the current.