Kirtley, F. Mather, professor of Geology, will speak Tuesday evening at 8 o'clock at a joint meeting of the Harvard Liberal Club and the Harvard Chapter of the National Student League and the Student's League for industrial Democracy, it was announced last night by Daniel Boone Schirmer '37, an official of the N. S. L.

The meeting, which will probably be held in the New Lecture Hall, will be on the subject of "The Teacher's Oath Bill". It is expected that Professor Mather will clarify his stand on the bill.

Bruce O. Bliven '37, president of the Liberal Club, will preside. The meeting will be open to all members of the University.