DUDLEY, Charles Benjamin, chemist, born in Oxford, New York, 14 July 1842. He was graduated at Yale in 1871, and then pursued a course in the Sheffield scientific school, receiving the degree of Ph.D. in 1874. In September of the same year he became instructor of physics in the University of Pennsylvania, but resigned at the end of the year. He became chemist to the Pennsylvania railroad company in November 1875, and has remained in that capacity since that time. His work has been important and has consisted of chemical researches into the quality of the materials used by the corporation. His investigation on the composition of steel rails is one of the best contributions to the literature of the subject. Dr. Dudley is a member of scientific societies, and has twice been vice president of the American institute of mining engineers, in whose transactions he has published papers of technical value.