By means of this method an accurate measurement of the functions of hearing can be made and a definite prognosis can be given. I never use any of the various named qualitative fork tests for hearing, because they have no value to one who employs this system. FOOT NOTE—In the chart T is used, meaning that tone is heard, while S indicates sound but no tone. FOOT NOTE—It is not the purpose to give any detailed or differential methods of diagnosis because if one cares to treat these diseases he will of course, study a special text on this subject. The methods here given are only for the general practician who wishes a general idea of the condition present. Summary of Diagnosis of Different Stages of Catarrhal Deafness =First Stage.= 1. Fork 32 128 2048 B. C. 35 20 A. C. T 70 40 2. The drum is only slightly retracted but freely movable. 3. Whisper heard from five to twenty feet. 4. Ingersoll watch heard from 30 to 150 inches. =Second Stage.= 1. Fork 32 128 2048 B. C. 40 20 A. C. T 60 40 Note that the tone of the 32 fork is heard, the 128 fork has increased in bone conduction and reduced in air conduction but that the bone-air ratio is direct, that is the patient hears longer by air than by bone conduction. Note also that the high fork is still normal. 2. The drum will be found retracted but that part to which the malleus is attached is still movable when tested with the auroscope. 3. The whisper is heard from two to ten feet. 4. The Ingersoll watch is heard from six to sixty inches. 5. Presbyacusia but not paracousia is present. =Third Stage.= 1. Fork 32 128 2048 B. C. 45 15 A. C. S 20 30 The typical diagnostic points in third stage catarrhal deafness are: 1. Tone for the 32 fork is lost. 2. There is an inverted bone-air ratio for the medium fork. The drum is retracted and the malleus fixed. 4. The whisper may be heard at less than one foot or not at all. 5. The Ingersoll watch is heard less than six inches from the mastoid. 6. Paracousis Willisiani is present. For the general practician this is important because he can make a rather definite prognosis. =Treatment.=—The treatment will be given briefly because space would not permit of lengthy discussions of details of methods and technic. FOOT NOTE—Note that the patient hears the tone of the low fork, that the 128 fork has its bone conduction slightly increased (30 to 35) that the air conduction is slightly decreased (90 to 70) and that the high fork remains normal. A careful examination should be made for some source of focal infection about the nasopharyngeal tract. Chronic or subacute tonsillitis,