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Excerpt from The Function of the Eustachian Tube, in Its Relation to the Renewal and Density of the Air in the Tympanic Cavity, and to the Concavity of the Membrana Tympani We cannot make' experiments on the eustachian tube, by instru mental means, without incurring some risk of doing injury to this important organ but this passage is sometimes abnormally open, at others abnormally closed. On such occasions we have Opportuni ties of judging the effect of these conditions upon (a) the air density in the cavity and (é) the concavity of the membrana tympani Both of these conditions of the eustachian tube are very favorable for this investigation, as they can be temporarily overcome, so that the hearing may be increased equal to or beyond the patient's usual acuteness. The phenomena Observed during the patent condition of this pas sage, if carefully examined, demonstrate certain facts that appear to question the correctness of the deglutition method of supplying air to the middle ear. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.