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| Illustration of an ear trumpet with two apertures, from: John Harrison Curtis’s A Treatise on the physiology and pathology of the ear: containing a comparative view of its structure, functions, and various diseases; observations on the derangement of the ganglionic plexus of nerves, as the cause of many obscure diseases of the ear. Together with remarks on the deaf and dumb. 6th ed. London: Longman, 1836. (p. 181). |