Nature has provided that for quiet breathing when at rest the air shall pass through the nose. But when a person is taking active exercise, and consequently demands more air, he naturally and of necessity opens the mouth so as to breathe more fully. While speaking or singing the air is necessarily taken in through the mouth.
BREATH CONTROL
Firmness of tone depends upon steadiness of breath pressure. Steadiness of tone depends upon a control of the breath which allows a minimum volume of air to pass out under sufficient tension to produce vocalization.
The tension and flow of breath can be gradually lessened until the tone vanishes and not even a whisper remains.
Power and largeness of tone depend first upon the right use of the resonant cavities, and second upon the volume of breath used under proper control.
In producing high tones the breath is delivered in less amount than for the low tones, but under greater tension. Absolute control of the breath is necessary to produce the best results of which a voice is capable. Full control of the breath insures success to a good voice; without it the best voice is doomed to failure.
When muscular action is fully mastered, and the proper method of breathing understood and established, the muscles of inspiration and expiration will act one against the other, so that the act of breathing may be suspended at any moment, whether the lungs are full, or partly full, or empty. This is muscular control of the breath. Correct breathing is health giving and strength giving; it promotes nutrition, lessens the amount of adipose tissue, and reinforces every physical requisite essential to speaking and singing.
A CURE FOR NERVOUSNESS
It cannot be too widely advertised that the surest remedy for that torture of singers and speakers, nervousness, is the great tranquillizer,—quiet, deep breathing, deeply controlled. The breath of nervousness is quick, irregular, and shallow, therefore, take a few, slow, deliberate, deep, and rhythmic inhalations of pure air through the nostrils, and the panting gasp of agitation will vanish. As a help toward deepening the breath and overcoming the spasmodic, clavicular habit, inhale quietly and slowly through the nose, or slowly sip the air through the nearly closed lips as if you were sipping the inmost breath of life itself.