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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: In another volume of the Transactions above referred to, and of the same year, two most curious cases are related of persons who retained the sense of hearing, not in a perfect, but in a very considerable degree, notwithstanding the almost total loss of the membrane we have been describing. In one of these cases the use here assigned to that membrane, of modifying the impressions of sound by change of tension, was attempted to be supplied by straining the muscles of the outward ear. ' The external ear, ' we are told, ' had acquired a distinct motion upward and backward, which was observable whenever the patient listened to any thing which he did not distincdy hear: when he was addressed in a whisper, the ear was seen immediately to move; when the tone of voice was louder, it then remained altogether motionless.' It appears probable, from both these cases, that a collateral, if not principal, use of the membrane, is to cover and protect the barrel of the ear which lies behind it. Both the patients suffered from cold: one, ' a great increase of deafness from catching cold;' the other, ' very considerable pain from exposure to a stream of cold air.' Bad effects therefore followed from this cavity being left open to the external air; yet, had the Author of nature shut it up by any other cover, than what was capable, by its texture, of receiving vibrations from sound, and, by its connection with the interiour parts, of transmitting those vibrations to the brain, the use of the organ, so far as we can judge, must have been entirely obstructed. CHAPTER IV. OF THE SUCCESSION OF PLANTS AND ANIMALS. The generation of the animal no more accounts for the contrivance of the eye or ear, than, upon the supposition stated in a preceding chapter, the production of a watch by the motion...
| ISBN-13 | 9780217024648 |
|---|---|
| ISBN-10 | 0217024645 |
| Weight | 0.72 Pounds |
| Dimensions | 9.00 x 6.00 x 0.49 In |
| List Price | $19.66 |
| Format | Paperback |
|---|---|
| Pages | 216 pages |
| Publisher | |
| Published On | 2009-08-01 |
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