CONTENTS. xvii 



902. The Glottis. The Superior Aperture and the Several Features of 



the Larynx 309 



903. The Minute Structure of the Parts of the Larynx 312 



904. The Laryngoscopic View of the Larynx 313 



905. The Fundamental Features of the Voice; Loudness, Pitch, and 



Quality. The Main Conditions of the Utterance of Voice; _ 



Adduction and Tightening of the A r ocal Cords 310 



906. The Muscles of the Larynx 317 



907. The Action of the Muscles in Reference to narrowing and widen- 

 ing the Glottis and to tightening and slackening the Vocal Cords 322 

 908. The Nervous Mechanisms of the Larynx. The Respiratory Move- 

 ments of the Larynx 323 



909. The Nervous Mechanism of Phonation 325 



910. The Cortical Area for Movements of the Larynx 325 



911. The Different Kinds of Voice. Changes in the Glottis other than 



those of mere Adduction and General Tension 326 



912. Chest-Voice and Head- Voice. The Registers of the Voice. The 



Complexity of the Laryngeal Movements 328 



913. The Uses of the Ventricles and other Parts of the Larynx ... 332 



914. The ' Break ' in the Voice at Puberty 332 



SECTION II. 



SPEECH. 



915. Speech, a Mixture of Musical Sounds and of Noises 333 



916. Vowels and Consonants 333 



917- The Manner of Formation of the Several Vowels 334 



918. The Manner of Formation of the Several Groups of Consonants . 337 



919. The Manner of Formation of the more Important Individual 



Consonants 338 



SECTION III. 



ON SOME LOCOMOTOR MECHANISMS. 



920. The General Characters of the Actions of Skeletal Muscles ... 342 



921. The Erect Posture 343 



922. Walking 343 



