Deafness practically illustrated / [James Yearsley].

  • James Yearsley
Date:
[1849]
Catalogue details

Licence: Public Domain Mark

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

    146/200 page 134
    From the want of a passage for the breath behind the soft palate, and through the nose, there is not infre- quently a great difficulty in pronouncing letters in the production of which the soft palate is concerned. In short, it is of essential importance to a proper method of speech, that the air should have free ingress and egress through the nose. For the same reason there is generally arketatee a difficulty in hawking mucus from the back of the throat and the posterior nares. Expectoration cannot be properly and freely performed. From the same cause, also, there is frequently a difficulty and even an impossibility of blowing the nose, which is excessively inconvenient and disagreeable. The effects of this kind of obstruction to the sense of smell are very perceptible. Without the power of inspiring through the nose, we lose in great measure the capability of drawing odorous particles within the sphere of the olfactory nerve. In addition to the diffi- culty thus occasioned, it is certain that a tolerably healthy state of the mucous membrane is necessary for the proper exercise of the sense. Common catarrh may be taken as an instance, in which the obstruction caused by the swelling of the mucous surface, and the alteration in the secretion from the nasal, or schneide- rian membrane, either blunts or temporarily destroys the olfactory sense. ‘Those in whom the nose is per- manently obstructed by thickening of the mucous mem- brane are much in the same situation, as, in addition to the simple obstruction, the secretion of mucus is generally disordered either by excess or deficiency. But I was led to notice this disagreeable affection more particularly, from an interesting case which came
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