Monday, April 25.

*MORNING PRAYERS. Rev. Alexander Mann. Appleton Chapel, 8.45 A. M.

PRESIDENT AND FELLOWS OF HARVARD COLLEGE. Meeting at 50 State street, Boston, 10.30 A. M.

*SEMINARY OF AMERICAN INSTITUTIONS. "Quasi-Slavery." Mr. J. C. Elder. Sever 9, 3.30 P. M.

*EXHIBITION OF MODERN BUSINESS APPLIANCES. Upper Massachusetts Hall, 1 to 6 P. M. This exhibition has been arranged by the Graduate School of Business Administration, and will remain open from April 25 to April 29, inclusive.

*PHYSICAL COLLOQUIUM. "The Thomson Effect, the Hall Effect, the Nernst Effect, and the Moreau Formula connecting them." Professor Hall. Jefferson Physical Laboratory, Room 24, 5 P. M.