Wednesday, Feb. 21.
*Harvard Camera Club. Annual Exhibition of Photographs begins today. Phillips Brooks House, 10 a. m.
**History of Classical Studies. II. The Revival of Classical Learning in the Fifteenth Century. Professor Morgan. Sever 18, 3.30 p. m.
Mathematical Conference. Papers: On Necessary and Sufficient Conditions. Mr. W. E. Hocking.--On a Fundamental Theorem in the Theory of Numbers. Mr. C. N. Haskins. Sever 24, 4.30 p. m.
Physical Colloquium. Masses of Ions. Discussion of an Important Paper by Professor J. J. Thomson. Mr. G. W. Pierce. Jefferson Physical Laboratory, room 24, 5 p. m.
**Harvard Christian Association. Association in Religious Life. Mr. E. von Mach. Phillips Brooks House, 6.45 p. m.
*Harvard Catholic Club. Christian Economics. Rev. Francis Ryan, of Toronto. Lecture Room of the Fogg Museum, 8 p. m.
Thursday, Feb. 22.
Washington's Birthday. A holiday in all Departments of the University.
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Ethics and the Descriptive Sciences.
