Lincoln Steffens will deliver a lecture on "The McNamara Dynamiters: Social Symptoms," in the Living Room of the Union tomorrow evening at 8.15 o'clock. The address will be open only to members of the Union.

Mr. Steffens has been connected with the New York Evening Post. McClure's Magazine and the American Magazine. He is the author of "The Shame of the Cities," "The Struggle for Self Government," "The Saving of Clarence Darrow" and other works on social and political problems.