Deafness practically illustrated / [James Yearsley].

  • James Yearsley
Date:
[1849]
Catalogue details

Licence: Public Domain Mark

Credit: Deafness practically illustrated / [James Yearsley]. Source: Wellcome Collection.

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    extremely rare occurrence. From a statistical table of 1000 cases admitted at the Metropolitan Ear Institution, it appears that only five presented themselves with this disease. | The diseases of the auditory passage are more de- serving of consideration, both from their frequent occurrence, and tendency to weaken, by their continu- ance, the power of hearing. This passage is occa- sionally much curved, and from this circumstance great difficulty is sometimes experienced in obtaining a view of the membrane of the tympanum. At all times it should be a sine gua non with the practitioner to ascertain the precise condition of this membrane. An instrument, therefore, which will enable us to obtain this desideratum with facility, cannot fail to be duly appreciated; for it is unquestionably owing to the omission of a careful local investigation of the audi- tory passages, that the greatest confusion and errors in treatment have arisen. udging from the shape of the various instruments for the inspection of the auditory passage, which are offered for sale by the surgical-instrument maker, it has appeared to me, that their proper application has been lost sight of or misunderstood. Whoever shaped them must have supposed that the whole extent of the auditory passage was capable of dilatation, whereas, from its construction, it is obvious, it can only be so at its very entrance. A better view can be obtained by straightening the canal than by dilating it ; and therefore I some time ago proposed the speculum auris, as represented in the plate. Fig. 1. Speculum proposed by Kramer. Fig. 2. The author’s Speculum.
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