Chapter 14

THE FALLACIES OF FORWARD EMISSION, CHEST RESONANCE, AND NASAL RESONANCE

Sir Morell Mackenzie's analysis of the acoustic principle supposedly involved in "forward emission" has already been quoted. That this analysis involves a complete misunderstanding of the laws of acoustics need hardly be said. When stated in precise terms, the fallacy of the "forward emission" theory is evident:

"On issuing from the vocal cords the tone is directed in a curved path, around the back of the tongue. There the tone is straightened out, and made to impinge on the roof of the mouth at a precisely defined point. From this point the tone is reflected, not directly back, as it should be, since the angles of incidence and reflection must be equal. Instead of this, the tone is reflected forward, out of the mouth, necessarily again taking a curved path, to avoid striking the front teeth." Naturally, no muscular action has ever been defined for causing the tone to perform this remarkable feat.

The "forward emission" theory assumes the existence of a current of air, issuing from the vocal cords as a tone. In other words, the tone is supposed to consist of a stream of air, which can be voluntarily directed in the mouth, and aimed at some precise point on the roof of the mouth. This is an utter mistake.

There is no "column of vibrating air," or "stream of vocalized breath," in the mouth during tone-production. In the acoustic sense, the air in the mouth-pharynx is still air, not air in a current. The only motion which takes place in the air in this cavity is the oscillatory swing of the air particles. To imagine the directing of air vibrations in the mouth, as we direct a stream of water out of a hose, is absurd.

What then is the "forward tone"? There must be some reason for this well-known effect of a perfectly produced voice,--the impression made on the hearer that the tones are formed in the front of the mouth. There ought also to be some way for the singer to learn to produce tones of this character. A consideration of this feature of the vocal action is reserved for Chapter IV of part III.

_Chest Resonance_

Who was originally responsible for the doctrine of chest resonance, it would be impossible now to determine. Were it not for the fact of this doctrine having received the support of eminent scientists (Holmes, Mackenzie, Curtis, and many others), it might be looked upon as a mere figure of speech. That the tones of the voice are reinforced by the resonance of the air in the chest cavity, is an utter absurdity. In the acoustic sense, the thorax is not a cavity at all. The thorax is filled with the spongy tissue of the lungs, not to mention the heart. It is no better adapted for air resonance than an ordinary spherical resonator would be, if filled with wet sponges.

_Nasal Resonance_

Enough was said of the theories of nasal resonance in Chapter IV of Part I to show the unscientific character of all these theories. It remains only to point out the misconception of acoustic principles, contained in all the discussions of the subject. This is very much the same as in the theory of "forward emission," viz., that the tones of the voice consist physically of a "stream of vocalized breath." The mistaken idea is, that nasal resonance results from part or all of the expired breath passing through the nose.

What is nasal resonance? How is it caused? What is its effect on the tones of the voice? These questions have never been answered. It can however be proved that a satisfactory science of Voice Culture is not in any way dependent on obtaining an answer to these questions. This much is definitely known:

1. If the resonance of the air in the nasal cavities exerts any influence on the tones of the voice, this influence cannot be increased, diminished, or prevented by any direct action on the part of the singer. Shutting off the entrance of the breath, by raising the soft palate, is possible as a muscular exercise. But it is impossible to perform this action, and to sing artistically, at the same time. To produce any kind of tone, while holding the soft palate raised, is extremely difficult. In a later chapter it will be seen that this action has no place whatever in the correct use of the voice.

2. As the nasal cavities are fixed in size and shape, the singer cannot control or vary any influence which they may exert as a resonator.

3. Independent of any thought or knowledge of how the nasal quality of tone is caused, the singer has perfect voluntary control over this quality by the simple, direct influence of the will. A singer may produce nasal tones, or tones free from this faulty sound, at will, with no thought of the mechanical processes involved. All that is required is that the singer have an ear keen enough to recognize the nasal quality in his own voice, as well as in the voice of any other singer.