Joseph Jefferson at Yale.

NEW HAVEN, CONN., May 2. - Joseph Jefferson, the actor, lectured at Yale today on "Dramatic Art." He was introduced by President Dwight, and a crowded and fashionable audience was present.

Mr. Jefferson created something of a sensation by denouncing in unmeasured terms the practice at Yale and many colleges, of giving no attention to pure dramatic art, but giving farce comedies such as "Mr. Napoleon," the play in preparation by the Yale Secret Societies. Mr. Jefferson looked on the practice as a sign of degeneracy.