EAR Appraisal of Fenestmtion Operation. KENNETH M. DAY (Pittsburgh). Arch. ofOtolaryng., 1945, xliv, 5, 547"559-The author reports his complete series of 100 cases operated on during a period of six years up to December, 1945. Successful results were obtained in eighty cases. Nearly every failure is attributed to faulty selection, to technical faults connected with the operation and post-operative care, or to post-operative complications. The fenestra closed in two of the first ten cases, in

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... en of the next forty, and in but one case in the last fifty. There have been six revisions, three of which were successful. The author concludes that the operation is a gamble at best and one cannot predict when it will prove to be a failure. However, with improved technique, experience and understanding, the percentage of failures has decreased from year to year. The successful restoration of practical speech hearing can definitely be attained in properly selected patients, and maintained over «. period of years. This is a well-balanced appraisal, to which it is not possible to do full justice here, but which merits study. R. B. LUMSDEN. Effect of Obliteration of the Endolymphatic Sac and Duct in the Monkey. -13. In the seven monkey ears in which it was attempted to destroy the endolymphatic sac and duct without damaging other labyrinthine structures the following results were accomplished : in three ears not more than exposure and possibly simple drainage had been accomplished. In one the sac and the major portion of the medial dilatation, sinus II, were destroyed. In one there was complete destruction of the sac and sinus II, plus accidental opening of the posterior semicircular canal. In two the sac and sinus II were completely destroyed without operative injury of other labyrinthine structures. None of the animals was observed to have any gross disturbance of equilibrium on the day following operation or afterwards. No nystagmus was observed after the animals were completely out from under the anaesthetic. Pressure exerted in the cavities over a temporary pack at operation in some of the ears produced no conjugate deviation of the eyes such as occurs routinely when a fenestra is made in a semicircular canal without injuring the membranous canal. The animals were killed from two to three and a half months after the operation, and perfused. The extent of the operative lesion was determined by histological examination. No infections were found in the middle ear, the mastoid process or the 48 use, available at https://www.cambridge.org/core/terms. https://doi.