Monday, December 18.

5.00--Physical Colloquium. "The Principle of Similitude," by Professor R. C. Tolman, of the University of Illinois. Jefferson Physical Laboratory Room 3.

7.30--Christmas service of Divinity School and Andover Theological Seminary in Divinity Chapel.

8.00--Modern Language Conference. "Literary Backgrounds: a Study in Description," by Mr. F. W. C. Herse '99. Conant Common Room.

8.00--Cercle Francais play, "L'Aventurier." Agassiz House, Cambridge.

8.00--Finals of interclass debates in Sever 11.

Tuesday, December 19.

9.00-6.00--Senior elections. Phillip Brooks House.

4.00--Meeting of Faculty of Arts and Sciences in University 5.

8.00--Christmas carol service by student choir of Andover Theological Seminary in Andover Chapel.

8.00--Physical Colloquium. "Penetration of Tissue by Acids," by Dr. William J. Crozier, of the Bermuda Biological Station. Conant Common Room.

8.00--Lecture on "Les Champs de Bataille du Nord de la France," by Professor Emm. de Martonne, of the Sorbonne, Paris. Geological Lecture Room, University Museum.

Wednesday, December 20.

2.15--Cercle Francais play, "L'Aventurier Copley Theatre, Boston.

4.45--Chemical Colloquium. "The Structure of the Organic Molecule," by Professor G. N. Lewis, head of the department of chemistry at the University of California. Coolidge Memorial Laboratory.