A Classification of Deafness Based on the Effect of Deafness on Efficiency in Life.

THE DEAF CLASSIFIED FROM THE POINT OF VIEW OF INCAPACITY AS A RESULT OF DEAFNESS: (a) The true deaf-mute; developmental.-(b) The muted or semi-muted, totally deaf because of disease occurring shortly after birth.-(c) The speaking deaf, totally deaf from disease occurring after two years of age.-(d) Partially deaf, hard of hearing.Hearing tests useless except in (d).-Treatment useless except in (d).SYPHILIS: its association with congenital deafness; percentage due to this cause, in children.Incapacity due to deafness.-Aids to hearing.-Prevention of deafness.