A practical treatise on the diseases of the ear including the anatomy of the organ . Ton TroltscWs Otoscope, actual size. 84 METHOD OF EXAMINING MEMBEANA TYMPANI. vious knowledge that it had been suggested by others, al-though Dr. Hoffman, of Westphalia, had previously, in 1841,used an ordinary shaving mirror with a central opening for theexamination of the ear. Professor Edward Jaeger, in his workon Cataract and Cataract Operations, published in 1853, sug-gests that his ophthalmoscope may be used with the concavemirror of four inches focal distance, for the examination of the Fig. Method
A practical treatise on the diseases of the ear including the anatomy of the organ . Ton TroltscWs Otoscope, actual size. 84 METHOD OF EXAMINING MEMBEANA TYMPANI. vious knowledge that it had been suggested by others, al-though Dr. Hoffman, of Westphalia, had previously, in 1841,used an ordinary shaving mirror with a central opening for theexamination of the ear. Professor Edward Jaeger, in his workon Cataract and Cataract Operations, published in 1853, sug-gests that his ophthalmoscope may be used with the concavemirror of four inches focal distance, for the examination of the Fig. Method of Examining the Auditory Canal and Membrana Tympani external auditory canal. I have also been informed by nu-merous practitioners that they have often used the ophthalmo- METHOD OF EXAMINING MEMBRANA TYMPANI. 85 scopic mirror for examining the ear; but in spite of all thesestatements, and the fact that Frank,* in his work on the Ear,gives a sketch of Hoffmans otoscope, the credit of the introduc-tion into general use of the concave mirror for the examinationof the ear as certainly belongs to Von Troltsch, as the inven-tion of the ophthalmoscope to Heinrich Helmholtz. It issomewhat surprising, however, that after the description whichFrank gives in his text-book of Hoffmans method, and thedrawing which he furnishes of the mirror, no attention waspaid to the subject until Von Troltsch revived it, withoutknowing of Hoffmans apparatus. I introduced the use of the aural mirror, or otoscope as itshould be called, into the practice of the New York Eye andEar Infirmary, in 1863, where
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