338 



Br. Felix Semon 

 Fig. 7. 



[March 13, 



At the next note higher, F sharp, treble clef, top line, another 

 change in the quality of the voice occurred, and with it a change in 

 the laryngeal mechanism, which is displayed in the next pair of 

 photographs. The voice has broken into the upper or head register 



Fig. 8. 



and the chancje in the mechanism is decided. The vocal cords are 

 reduced in length and appear to be narrower. The edges of the 

 cords are closer together, only a narrow linear slit being left between 

 them ; the capitula Santorini are tilted backward and the cartilaginous 

 portion of the glottis is nearly or quite closed. The position of tlie 

 epiglottis is about the same as when j)roduciug the note before the 

 break. 



The opinion prevails that in the production of tones in the upper 

 register some portion of the edges of the vocal cords are in contact or 

 pressed tightly together ; in other words, that stop-closure occurs. 



