As recently great importance has often been ascribed to these abnormal movements of the glottis in the generation of sound, I have felt bound to mention them.
RESULTS OF THE FOREGOING OBSERVATIONS
In consequence of the observations above described, the following facts may be established:
I. We have found five different actions of the vocal organ:
1. The first series of tones of the chest register, in which the whole glottis is moved by large, loose vibrations, and the arytenoid cartilages with the vocal ligaments are in action.
2. The second series of the chest register, when the vocal ligaments alone act, and are likewise moved by large, loose vibrations.
3. The first series of the falsetto register, where again the whole glottis, consisting of the arytenoid cartilages and vocal ligaments, is in action, the very fine interior edges of the ligaments, however, being alone in vibrating motion.
4. The second series of the falsetto register, the tones of which are generated by the vibrations of the edges alone of the vocal ligaments.