Abstract
From the relation between the effectiveness of a hearing aid and the threshold curve of air conduction the following results were obtained: 1) In cases of conductive or mixed deafness it was difficult to decide the efficiency of a hearing aid by considering only the threshold curve of air conduction. 2) In some cases of perceptive deafness, the efficiency of a hearing aid was indicated by the air conduction curve. For instance : in the cases in which the air conduction curve shows a slow decline in the middle and high tone ranges, in which then the average hearing loss indicates 40∼55 db, the improvement of hea- ring with hearing aids can be expected; but in the cases where the air conduction curve indicates an abrupt fall in the high tone range, the use of a hearing aid will be of no avail.
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