Rev. George E. Horr, D.D., president of the Newton Theological Institution, will deliver the annual Dudleian lecture in Emerson J this evening at 8 o'clock. The title of the lecture will be "Sacerdotalism." The subject is the last of the series of four prescribed in 1750 by the founder of the lectureship, Judge Paul Dudley, 1690, to explain and prove "the validity of the ordination of ministers and pasters of the church." The lecture will be open to the public.