LXVIL] 



LARYNGOSCOPE. 



317 



is reflected on to the uvula by the reflecting mirror, and, on introducing the 

 small laryngeal mirror, by a little adjustment one sees the image of the 

 larynx in the plane mirror. Or one may use in a similar way the apparatus 

 of Foulis. In Dr George Johnson's method, the ordinary reflector is strapped 

 on to the forehead, and the observer places himself in iront of a toilet mirror. 

 In a line with and slightly behind the mirror, and on one side of the observer 



. ___< "- - ~^^-^=^^ ..-+ILUMUS. 



FIG. 242. Eonig's Manometric Flame Apparatus. 



place a lamp. By means of the reflector, the image of the fauces seen in the 

 mirror is illuminated. Introduce the laryngeal mirror, when the image of the 

 larynx is seen in the toilet mirror. 



3. Analysis of Vowel Sounds. 



Use Konig's apparatus, as shown in fig. 242. Connect the tube of the 

 capsule with the gas supply, light the gas-jet, and sing the vowels A, 

 E, I, O, U in front of the open trumpet- shaped tube shown in the figure. 

 With the other hand rotate the mirror (M), and observe the serrated reflec- 

 tion of the flame in the mirror, noticing how the image in the mirror varies 

 with each vowel sounded. 



