Chapter VII
Reading edition
CHAPTER VII.
SOUND—THE LARYNGOSCOPE—THE LARYNX RECONSIDERED.
Some study of physics desirable—Sound and vibrations—The sounding body—Experiments to illustrate the principles of sound—Qualities of sound—Animals and perception of sound—The range of hearing in man—The larynx as a musical instrument—Experiments of Johannes Müller—Discovery of the laryngoscope by Garcia—Description of the instrument—Method of using the laryngoscope—The difficulties—Auto-laryngoscopy—The importance of both laryngoscopy and auto-laryngoscopy—Change in size of the larynx due to use—Delicate changes in the laryngeal mechanism—Changes in the larynx during adolescence—Warnings—The "breaking" of the voice—Analogies with fatigue, etc.—When should singing be begun?—Singing with others—Choral singing 97