The whirling currents of tone circling around their focal point (the attack) find a cup-shaped resonating cavity when they reach the front of the mouth and the lips, which, through their extremely potent auxiliary movements, infuse life and color into the tone and the word. Of equal importance are the unimpeded activity of the whirling currents of sound and their complete filling of the resonating spaces in the back of the throat, the pillars of the fauces, and the head cavities in which the vocalized breath must be kept soaring above the larynx and soaring undisturbed.
In the lowest range of the voice the entire palate from the front teeth to the rear wall of the throat must be thus filled. (See plate.)
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With higher tones the palate is lowered, the nostrils are inflated, and above the hard palate a passage is formed for the overtones. (See plate.)
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This air which soars above must, however, not be in the least compressed; the higher the tone, the less pressure should there be; for here, too, whirling currents are formed, which must be neither interrupted nor destroyed. The breath must be carried along on the wall of the throat without compression, in order to accomplish its work. (See plate, high tones.)
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