A text-book on diseases of the ear, nose and throat . ly free from obstruc-tion. If it is, the eye of the observer should, after ascertaining thestate of the wall of the canal, seek the membrana tympani. The chiefobstacle in such a search is usually the misdirection of the axis of thefunnel. This, instead of being made to correspond with the axis of theauditory canal, is by the unskilled usually so directed that the light fallsupon the sides of the canal or only partially on the drum-head. Henceit is not at all uncommon to hear a diagnosis made for the membranatympani which is based entirely o
A text-book on diseases of the ear, nose and throat . ly free from obstruc-tion. If it is, the eye of the observer should, after ascertaining thestate of the wall of the canal, seek the membrana tympani. The chiefobstacle in such a search is usually the misdirection of the axis of thefunnel. This, instead of being made to correspond with the axis of theauditory canal, is by the unskilled usually so directed that the light fallsupon the sides of the canal or only partially on the drum-head. Henceit is not at all uncommon to hear a diagnosis made for the membranatympani which is based entirely on a view of the condition of the skinlining the auditory canal. What should be seen at the fundus of the canal is described on pages16 to 20, yet it will be a long time before the eye can so accommodate itselfto the conditions of illumination in the external ear as to interpret fullywhat it sees. The experienced eye is able to resolve into depressions,elevations, curves, etc., things which to a beginner seem to be entirely inthe same plane. Fig. Forceps for removing foreign bodies from the ear. Bemoval of Obstacles to a Vieiv of the Membrana Tympani.—It requiresbut a small object—a few stiff hairs or a flake of cerumen or of epithe-lium—to obstruct the view of the drum-head. All such obstacles aremost easily removed by a few syringefuls of warm water, which will,however, render the drum-head a little macerated, and thus deprive it ofwhatever lustre it may have had. This must be borne in mind in lookingat the drum-head after warm water has been syringed upon it. There-fore, when it is especially desirable that the amount of natural lustre in a IXSTRUMEXTAL EXAMIXATIOX OF THE EAR. 81 Fig. til.
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