PROFESSOR RUSSELL TO LECTURE

Professor Henry Norris Russell, director of the observatory at Princeton University, will lecture this evening at 8 o'clock in Room 3 of the Jefferson Physical Laboratory. The lecture will be open to the public. Professor Russell's subject is "Ionization in Stellar Atmospheres."

Professor Russell is a member of the Research Association of the Mount Wilson Observatory of the Carnegie Institution. He is widely known for his research work toward establishing theories of stellar evolution.

Professor Harlow Shapley of the Harvard Observatory will probably introduce Professor Russell.