Among the great inventions which have originated in the lecture-room in which we are met are two of special interest to electricians — the application of gutta-percha to the purpose of submarine telegraph cables, and the electromagnet. This latter invention was first publicly described, from the very platform on which I stand, on May 23, 1825, by William Sturgeon, whose paper is to be found in the forty-third volume of the Transactions of the Society of Arts. For this invention we may right fully claim the very highest place. Electrical engineer ing, the latest and most vigorous oiishoot of applied science, embraces many branches. The dynamo for generating electric currents, the motor for transforming their energy back into work, the arc lamp, the electric hell, the telephone, the recent electromagnetic machin ery for coal-mining, for the separation of ore, and many hfitfiuass on the electromagnet.