Professor Rowland's Lecture.

One of the most interesting and instructive lectures which have been given here this year, was delivered last evening in the Jefferson Physical Laboratory by Professor Henry A. Rowland of Johns Hopkins University. The subject, "Modern views in relation to electrical currents," was treated in a very thorough and at the same time very simple manner, so as to be not only intelligeable but at the same time interesting to all. Professor Rowland briefly sketched the history of the discoveries in relation to electrical currents, and then expanded the theory now held by the leading physicists, to the effect that electrical currents are propagated like light waves, the ether which permeates and surrounds the universe. The theory and the arguments in its support were stated clearly and concisely and at the same time a number of the experiments were performed to acts as illustrations of the arguments. It was a notable fact that while all the experiments were simple in their nature, they were all right to the point and proved convincingly what they were meant to prove. Professor Rowland then went to the subject of lightning rods and gave a very clear idea of the duties they were intended to perform, and the best way to arrange them for fulfilling the purposes for which they are used. The lecture as a whole was extremely interesting, and at its close all felt that they had heard a subject will discussed by one who was evidently a thorough master of it.