"Heat" is the subject of the fourth of the series of symposiums that have been arranged by the Harvard chapter of Gamma Alpha Fraternity. The symposium will be open to the public and will be held tonight in the Union Living Room at 8 o'clock.

Professor A. B. Lamb G. '03, director of the chemical laboratory, will open the discussion from the chemical point of view. His topic will be "The Chemistry of Burning."

The engineer's aspect of heat will be presented by Professor H. N. Davis G. '03, professor of mechanical engineering in the University who will not use the lantern slides but is expected to use outline charts to illustrate the various manners in which heat may be employed industrially.

Professor Walter B. Cannon '96, George Higginson Professor of Physiology in the University, will close the symposium by a discussion of "The Regulation of Body Temperature."