A dissertation on the treatment of morbid local affections of nerves ... / by Joseph Swan.

  • Swan, Joseph, 1791-1874.
Date:
1820
Catalogue details

Licence: Public Domain Mark

Credit: A dissertation on the treatment of morbid local affections of nerves ... / by Joseph Swan. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    the case. Where the heating through the meatus externus has been perfect, and where there has been no apparent alteration in the structure of the head, face, &c. I have seen many who could hear from only one of these parts, and several who could not hear from any of them. If I stop my ears and rest my chin on the petrous portion of the temporal bone in a ma- cerated skull, and place my watch in contact with any part of the skull, I can hear the sound perfectly. I saw a boy who was born deaf and dumb, but had been taught to speak, and when a watch touched the left side of his face he could hear it, but when it touched anv part of the right side he could not in the least. A man who was recovering from an illness had become so deaf of the left ear that he could just hear my watch when put very near it: he heard perfectly of the right ear. I de- sired he would stop his ears until he could not hear my watch when put nearly in contact with them; I then let it touch the left side of the face, &c: he just heard it, but when I let it touch the right side, he heard it distinctly. If sound is conveyed mechanically through the flesh and bone, what in these two cases should hinder it from being heard distinctly,