Rev. G. F. Herrick, D.D., of Constantinopie, will deliver the fifth of a course of six lectures under the Hyde Foundation on the general subject "Christian and Mohammedan" in the Andover Seminary Building, Room A, this afternoon at 4.30 o'clock. His special topic will be "Christian and Mohammedan: The Problem of the Convert." The lecture will be open to members of the University and to the public.