Coloration of the Grand Canyon of the Yellowstone. Mr. J. B. Woodworth.--Erosion Movements in the Mystic Basin. Mr. R. W. Stone. Rotch Building, 8 p. m.

**Lectures on Electrical Conduction in Gases. VIII. The Zeemann Effect. Dr. H.H. Brown. Jefferson Physical Laboratory, Room 25, 8 p. m. (Postponed from March 28.)

Wednesday, April 3.

**Harvard Christian Association. Weekly Meeting. Address by Rev. Edward M. Noyes of Newton Centre. Brooks House, 6.45 p. m.

**Sophomore Debating Club. Debate. Sever 11, 7 p. m. Queston: "Resolved, That the United States Senate should have ratified the Hay-Pauncefote treaty without amendment." Affirmative: Whitaker's Camp.--Negative: Mann's Camp.

Thursday, April 4.

*Vesper Service. Appleton Chapel, 5 p. m.

**Lectures on Electrical Conduction in Gases. IX. The Mass of the Ions in Electric Discharge through Gases. Dr. H.H. Brown. Jefferson Physical Laboratory, Room 25, 8 p. m.

**Educational Conference. The Massachusetts State Board of Education: The Work of the Secretary and Agents. Hon. Frank A. Hill. Sever 17, 8 p. m.

Lecture on American Politics.

Under the auspices of the Harvard Civil Service Reform Club Bishop Potter, of New York, will lecture on "The Place of the Individual in Good Government." This lecture will be given in Sanders Theatre on Monday, April 22, at 8 p. m., and will be open to the public. Sections of the Theatre will be reserved till 7.50 p. m., for officers and students of the University.