. Diseases of the ear : a text-book for practitioners and students of medicine. ermined bv micro-scopic investigation ; the varieties met with are extremelynumerous, but as the treatment of the different forms doesnot vary essentially it is unimportant to discuss the conditionat length in a treatise devoted particularly to clinical macroscopic features, however, enable us to make areasonably accurate diagnosis as to the particular variety ofplant present in a given case. A white deposit usually con-sists of the aspergillus glaucus. Another variety is the asper-gillus flavus, th
. Diseases of the ear : a text-book for practitioners and students of medicine. ermined bv micro-scopic investigation ; the varieties met with are extremelynumerous, but as the treatment of the different forms doesnot vary essentially it is unimportant to discuss the conditionat length in a treatise devoted particularly to clinical macroscopic features, however, enable us to make areasonably accurate diagnosis as to the particular variety ofplant present in a given case. A white deposit usually con-sists of the aspergillus glaucus. Another variety is the asper-gillus flavus, the microscopic features of which are shown inFig. 86, while more rarely we*find the walls of the canal andthe surfaces of the membrane covered with irregular blackspots, a little smaller than the head of a pin, which are the Fig. 85.—Otomycosis. The canal is linedwith a thin deposit which covers thewalls and the surface of the membranatympani. The punctate areas on themembrana are caused by the increasedgrowth of the fungus in these situations.(Natural size.) DIAGNOSIS. 247. sporangia of the aspergillus niger. The growth of this latteris seldom as extensive as that of the other two varieties. Amicroscopic examination alone will enable us to distinguishwith certainty between otomycosis and the milder forms ofdesquamative inflammation involving the canal. The greaterconsistency of the epithelial plug and the imbricated arrange-ment of the scales usually give the observer a hint as to thenature of the condition present. It is probable that in nocase do these low forms ofvegetable life take root upon aperfectly healthy cutaneous sur-face ; it is necessary that theepithelium should be wantingover a small area at least, inorder that the plant may de-velop. Hence it is, that para-sitic inflammation of the mea-tus is usually coexistent withsome condition of the externalcanal or of the middle ear char-acterized by the presence ofmoisture. The epithelium ofthe canal is thus softened and
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