This paper is presented not as a record of things already achieved but to call attention to very significant possibilities of attainment in the prevention of deafness recently made available by means of modern methods of detecting and measuring hearing loss. For the perfection of those methods we are indebted to Dr. Harvey Fletcher of the American Bell Telephone Laboratories.
Statistics reveal that in the United States there are more than 3,000,000 persons seriously handicapped by impaired hearing. Von Troeltsch in 1881 stated that one person of every three over 20 years of age had subnormal hearing in one or both ears. Denker, in his most recent textbook, makes the startling statement that 25 per cent of school children whom he examined had less than one third the normal acuity of hearing for the whispered voice. In a recently conducted preliminary survey of several thousand school children in Minneapolis, the