DURHAM, June 4.—(P)—Com mencement exercises at Duke uni versity were to be completed here early tonight after the school had graduated the largest class in its history, 236, and conferred grad uate degrees upon 100 other stu dents. Before receiving degrees the students heard an address by Dr. Ray Lyman Wilbur, secretary of the department of interior, and former president of Leland Stan ford university. Greetings of North Carolina were brought by Govern or QO. Max Gardner,