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By way of the mentioned artificial structure of the ear we hear sounds, which probably comes to pass in the foüowing manner. The sound caught by the exterior ear and its élévations and cavities is transmitted to the conduit of the ear, whence it arrives +
Misc. Subj. CXLIV. Vol. VII. No. 17. +
THE ORGAN OF HEARING, EXPLAINED BY MEANS OF THE HUMAN EAR. +
The ear is composed of the exterior ear, w … The ear is composed of the exterior ear, which forms the entrance of the organ of hearing. It is a cartilage, whereof we observe the exterior and interior border of the ear (Fig. . I. IL I. 2.). Near it we see the fore skiit of the ear and the hind one (Fig. . I. IL 4. et 5). The cavity between both is called the ear's cockle (Fig. . I. II. 6.). The earlap is the extremity of it. (Fig. . I. IL J.). In the interior there is the conduit of the ear (Fig. . 1. II. y.). Under the common skin of the head are concealed the parolid glands, which separate the wax. At the extremity of the conduit of the ear appears the lympanum (Fig. . I. II. 9.) which envers the barrel of the drum. On tins elastick skin are collected the bones of hearing, viz, the hammer (Fig. . I. IL ir.), the anvil (I. II. 14), the stirrup. In the interior is the labyrinth. There is likewise to be found the Cochlea of the ear, thus called (Fig. . I. II. 111. 22.). The three semicircular Channels (Fig. . I: II. III. IV. 19.) open with five mouthes. With tbe ear communicate two nerves, viz, the hard one, or the nerve of union of the face, and the soft one, or the acoustic nerve, properly said, with its branches (Fig. . IV. 29. 30)aid, with its branches (Fig. . IV. 29. 30) +
The structure of the human ear is almost as ingeniously fraraed as that of the eye, as at first sight shews the annexed print, where vve behold in Fig. . r. the ear in its natural greatness, but in Fig. . 2. greatly magnified. +
These are the principal organs of the ear. The commentary of this Picture-Gallery gi. ves a more particular explication. +