**Sophomore Debating Club. Debate. Sever 11, 7 p.m. Question: "Resolved, That a three year's course for the degree of A. B. at Harvard is desirable." Principal Disputants.--Affirmative: DeBray's Camp.--Negative: Letchworth's Camp.

**Geological Conference. Papers: Recent Discussions on Peneplains. Professor Davis.--Wealden Structure in the Rocky Mountians. Mr. A. W. Grabau, Rotch Building, 8 p. m.

Wednesday, Dec. 13.

Board of Overseers. Special meeting at No. 50 State St., Boston, 11 a. m.

Prospect Union Course. V. Lecture on Dickens. Mr. Copeland. Sever 11, 4 p. m. Open to the public. Admission by tickets only.

Semitic Conference. Origin of the Sabbath. Professor Toy. Sever 8, 4.30 p.m.

*Physical Colloquium. Ionization of Gases. Mr. G. W. Pierce. Jefferson Physical Laboratory, room 24, 5 p.m.

*Harvard Christian Association. Foreign Missions Meeting. Phillips Brooks House, 6.45 p.m.

*Student Volunteer Committee. Stereopticon Lecture: Public Baths and Gymnasia. Hon. Josiah Quincy, Mayor of Boston. Address by Mr. Robert A. Woods, of the South End House. Lecture Room of the Fogg Museum, 8 p.m.

Thursday, Dec. 14.

*Vesper Service. Appleton Chapel, 5 p. m. The front seats are reserved for students and for officers of the University and their families, until 4.55.

Mathematical Conference. Report on Klein's "Famous Problems in Elementary Geometry." Mr. G. H. Albright. Sever 24, 4.30 p. m.

Harvard Engineering Society. Mechanical Ventilation and Heating: Forced Circulation. (Illustrated by the Stereopticon.) Mr. W. B. Snow. Colonial Club, 8 p. m.

Friday, Dec. 15.

*Divinity School. Devotional Service with Sermon. Mr. F. R. Griffin. Divinity Chapel, 7.30 p. m.