Abstract
Reports from various theaters of operation indicate that external otitis is a problem of considerable importance as a cause of lost man hours of work in certain tropical and subtropical regions. There have been repeated requests for a study of this disease with a view toward devising a simple and expedient treatment which can be used under field conditions. It is generally accepted that external otitis may be caused by bacteria, by fungi or by a mixture of bacteria and fungi. Of the varieties of fungi which have been isolated from the external ear,<sup>1</sup>species of Aspergillus appear to be the most frequently encountered in cases of external otitis.<sup>2</sup>Eleven species of the genus are listed by Dodge<sup>3</sup>as having been isolated from the aural canal. Penicillium and the closely related Scopulariopsis occur occasionally and are of relatively little importance.<sup>4</sup>The genus Mucor is represented by three species from the
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