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In this monogram the author has presented a detailed description of his fenestration operation. He describes in detail his early procedures in the two-stage operation, the indications, and results. This was originally presented in 1935. The second section was presented in 1939 as a supplement to his report of 1935. Here, too, he describes in great detail the indications for operation and the modifications in his technique. The third section of this monogram deals with a second supplement to the 1935 report. In view of the fact that the war interrupted much of his research and operative activities, the author states that after the termination of the war he was greatly influenced by the work of American surgeons (Lempert, Shambaugh Jr.). He discusses in this supplement (1) the psychoacoustic problem, (2) the surgical problem, and, finally, (3) the pathology. He also presents some further modifications in his technique and indicates