Children whose mental age is below ten years lack the ability to utilize incoming information perfectly enough to make fine phonetic distinctions among sounds. This is an experimental study of the growth and interrelationship between sound discrimination ability and mental age.

It is the purpose of this paper to make a general study of David Belasco's use of naturalism in the American theatre. More specifically, it is to determine Belasco's methods of achieving naturalism in his stage settings and lighting. From the study of his techniques and methods, and effort is made to establish his contributions to the naturalistic movement.