A text-book of the diseases of the ear for students and practitioners . ardness of Hearing and Deafness . . 796 Requirements in Regard to the Ears and Hearing of Applicants for Enlist-ment into the Army and Navy of the United States and of Great Britain 801Cerebral Disturbances of Hearing ...... 802 Word-Deafness ........ 804 Disturbances of Hearing due to Brain Tumours .... 807 Disturbances of Hearing in Locomotor Ataxia .... 813 Malformations of the Organ of Hearing . . .814 Deaf-Mutism ......... 818 Instruments to Aid the Hearing-Power of the Deaf .... 835 Appendix ......... 843 Index of Li
A text-book of the diseases of the ear for students and practitioners . ardness of Hearing and Deafness . . 796 Requirements in Regard to the Ears and Hearing of Applicants for Enlist-ment into the Army and Navy of the United States and of Great Britain 801Cerebral Disturbances of Hearing ...... 802 Word-Deafness ........ 804 Disturbances of Hearing due to Brain Tumours .... 807 Disturbances of Hearing in Locomotor Ataxia .... 813 Malformations of the Organ of Hearing . . .814 Deaf-Mutism ......... 818 Instruments to Aid the Hearing-Power of the Deaf .... 835 Appendix ......... 843 Index of Litebatuke ........ 849 Index .......... 862 EKEATA Page 7, 1. 12 from bottom, instead of cavity read concavity. Page 51, 1. 9 from bottom, instead of length read width. Page 91, 1. 15, for (£-£ inch) read (|-1| inches). Page 210, 1. 6, instead of with read without. Page 431, 1. 4 from bottom, instead of inflation read insufflation. Page 580, 1. 8 from bottom, instead of fossae read fossa. Page 687, 1. 9, instead of tympania secondari re-ad tymparia THE ANATOMICAL DIVISION OFTHE EAR. The sense-impressions, which we designate as sound-perception,become conscious through the specific excitation of the peripheralendings of the auditory nerve. Its delicate terminations lie uponmembranous supports which are surrounded by an aqueous fluid,and which act as the transmitting medium for the waves of supports rest in a cavity which is partly formed by rigidwalls. Besides this essential sound-perceiving apparatus, the higheranimals possess a sound-conducting apparatus which is endowedwith the property of receiving the various waves of sound andconducting them to the labyrinth. Accordingly, the organ of hearing is divided into two principaldivisions—the sound-conducting and the sound-perceiving ap-paratus. We will adhere to this classification, as it is the onlycorrect one from a physiological standpoint, and the more sobecause it can be combined with the older, p
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