When a tenor or soprano singer reaches the upper tones, say about
, or higher, there is considerable closing up in the larynx, much in the way in which the parts of the month are brought together in sucking. This is termed sphincter action, the mouth and the eyes being closed by such action, of which they are the most easily observed examples. As a result of this squeezing there is in some cases that reddening of the face and that tightness which is often felt uncomfortably, and which is straining, because when present in more than a very slight degree it is injurious, owing to congestion or accumulation of blood in the blood-vessels, with all the bad consequences of such a state of things. When the tightening does not go beyond a certain point it is normal—indeed, such sphincter action is inevitable; but it is the excess which is so common in tenors and others who strain for undue power, and to produce tones too high in pitch for their development or their method, which is so disastrous to the throat and to the best art also.
Fig. 34 (Spalteholz). Parts have been cut away to expose to view the whole of the inner surface of the larynx (lined with mucous membrane). An excellent view of the vocal bands and of the "ventricle" of the larynx, between them, is afforded.
When the vocal bands are in action their vibrations are accompanied by corresponding vibrations of the cartilages of the larynx—a fact of which any one may convince himself by laying his fingers on the upper part of the thyroid, especially when a low and powerful tone is produced. This vibration is not confined to the larynx, but extends to other parts—e.g., the chest itself, for when one speaks or sings a distinct vibration of the chest walls can be felt, though the extent to which this is present is very variable in different persons. As an ascending scale is sung the larynx can be felt (by the fingers) to rise, and the reverse as the pitch is lowered. This is due partly to the action of those muscles attached to the larynx which are not connected with the movements of the vocal bands, and partly to the influence of the expiratory air-blast. The glottis, partially closed as it must be in phonation, presents considerable resistance to the outgoing stream of air, hence the upward movement of the larynx when it is left free, and not held down by muscular action.
In singing and speaking the larynx should be steadied, otherwise the "attack," or application of the air-blast to the vocal bands, cannot be perfect. On the other hand, it is obviously incorrect to attempt to hold the larynx always in the same position. Holding down this organ by main force, as in the production of the so-called "straw bass," is one of the surest methods of producing congestion and consequent disorders of the vocal organs; and the author wishes to warn all voice-producers against such unnatural practices. Students of elocution and young actors often sin in a similar way, and "clergyman's sore throat" is almost always due to this or some similar misuse of the vocal organs. One's own sensations and common sense should never be disregarded, however eminent the teacher who recommends unphysiological methods.
PRACTICAL CONSIDERATIONS.
When the student has read the above description of the structure and functions of the larynx, and studied the illustrations well, he will be prepared to deal with the subject in a practical manner, and without that it is feared his ideas will remain somewhat hazy.
First of all, he should try to find the parts mentioned in his own person, following this up by examinations of others, for which purpose children make good subjects, as they have usually necks that are not too deeply padded with fat, and they may be easily led to take the examinations as a sort of fun.