The contents of this little book formed the subject of threelectures delivered at the Royal Institution "On the Mechanism ofthe Human Voice" and three London University lectures at King'sCollege on "The Brain in relation to Speech and Song." I haveendeavoured to place this subject before my readers in as simplelanguage as scientific accuracy and requirements permit. Where Ihave been obliged to use technical anatomical and physiologicalterms I have either explained their meaning in the text, aided bydiagrams and figures, or I have given in brackets the Englishequivalents of the terms used.
I trust my attempt to give a sketch of the mechanism of thehuman voice, and how it is produced in speech and song, may proveof interest to the general public, and I even hope that teachers ofvoice production may find some of the pages dealing with the brainmechanism not unworthy of their attention.
July, 1910
THEORIES ON THE ORIGIN OF SPEECH
THE VOCAL INSTRUMENT:
THREE QUALITIES OF MUSICALSOUNDS, LOUDNESS, PITCH AND TIMBRE
THE VOCAL INSTRUMENT AND ITS THREE PARTS
(1) THE BELLOWS AND ITSSTRUCTURE: VOLUNTARY CONTROL OF BREATH
(2) THE REED CONTAINED IN THEVOICE-BOX OR LARYNX: ITS STRUCTURE AND ACTION
(3) THE RESONATOR ANDARTICULATOR, ITS STRUCTURE AND ACTION IN SONG AND SPEECH
PATHOLOGICAL DEGENERATIVE CHANGES PRODUCINGSPEECH DEFECTS AND WHAT THEY TEACH
THE CEREBRAL MECHANISM OF SPEECH ANDSONG
LOCALISATION OF SPEECH CENTRES IN THEBRAIN
THE PRIMARY SITE OF REVIVAL OF WORDS INSILENT THOUGHT
CASE OF DEAFNESS ARISING FROM DESTRUCTION OFTHE AUDITORY CENTRES IN THE BRAIN CAUSING LOSS OF SPEECH
THE PRIMARY REVIVAL OF SOME SENSATIONS INTHE BRAIN
PSYCHIC MECHANISM OF THE VOICE
FIG.
1. The thoracic cage and its contents
2. The diaphragm and its attachments
3. Diagram illustrating changes of the chestand abdomen in breathing
4. Diagram of the cartilages of the voice-boxor larynx with vocal cords
5. Front view of the larynx withmuscles
6. Back view of the larynx withmuscles
7. Diagram to illustrate movements ofcartilages in breathing and phonation
8. Section through larynx and windpipe,showing muscles and vocal cords
9. ...