The Sequelæ of Suppurative Otitis Media *This paper is—with a few additions due to later researches—a thesis read for the degree of M.B. (Cantab) in Easter Term of 1889. It is an attempt to summarise our present knowledge of the various complications which may result from suppurative otitis media.

so that an inflammatory change is most easily propagated to the bone. The causes of this propagation lie chiefly in the want of free removal of inflammatory products of the mucous membrane: though the membrana tympani be perforated, the tympanic cavity is at the bottom of a long narrow channel, so that stagnation readily occurs; and once inflammation has spread to the bone, the carious and necrotic products are with difficulty discharged, and the inflammatory change progresses further. Such a process would be of less importance in any other bone,, but the petrous portion of the temporal bone occupies a unique position in that it has relations with important