This paper discusses the method of presenting in the curricula of engineering schools the fundamental electrical principles, emphasizing the desirability of presenting them as far as practical in a general way and of making clear the relations of specific applications, such as the relation between circuit theory equations as applied to power systems and to telephone systems, and the relation between ordinary circuit theory and the generalized electromagnetic equations. An outline is given of some interesting problems arising and results obtained in the application of electric principles to telephone systems.