The Philosophy Club invites all members of the University to an open meeting this evening at 7.30 in Emerson A, at which Dr. H. M. Sheffer '05, of the Department of Philosophy, will speak on "Some Philosophical Aspects of Einstein's Theory of Relativity." This is an opportunity to have presented with a minimum of technical language the meaning of certain concepts about which there has been much discussion and little understanding. Dr. Sheffer's interests and achievements in mathematical logic and especially in postulational theory should make his exposition appealing particularly to students of science. Discussion will follow.