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There must be no waste of power i.e., of the expiratory blast through escape of air that accomplishes no purpose. The blast must be so applied to the vocal bands, or, in other words, they must be so adapted to the blast that there is no waste of energy. If the bands approximate a little too late there is waste of breath power.
But of a hot summer's afternoon, after having already heard one sermon, which could not in the nature of things have the charm of novelty of presentation to the members of the home circle, and the theology of which was not too clear to tender apprehensions; with three hymns more or less lugubrious, rendered by a village-choir, got into voice by many preliminary snuffles and other expiratory efforts, and accompanied by the snort of a huge bassviol which wallowed through the tune like a hippopotamus, with other exercises of the customary character, after all this in the forenoon, the afternoon walk to the meeting-house in the hot sun counted for as much, in my childish dead-reckoning, as from old Israel Porter's in Cambridge to the Exchange Coffeehouse in Boston did in after years.
"In ordinary breathing the air is expelled from the lungs quietly, but rapidly; at no point of the breathing apparatus does the expired breath meet with resistance. In singing, on the contrary, the expiratory pressure is much more powerful, yet the expiration must be much slower.
That the glottis-closing muscles are too weak to withstand a powerful expiratory pressure is therefore an entirely erroneous statement. Owing to the small area of the under surfaces of the vocal cords, the air pressure against them is very small, in comparison with the total pressure exerted on the contents of the thorax by the expiratory contraction.
So far as the effect of the expiratory blast on the vocal cords is concerned, "controlling" the breath has no influence whatever. The vocal cords respond to the effective air pressure; they are not affected in any way by the opposed contractions of the breath muscles. "Opposed-muscular" breath-control is a sheer waste of time and effort.
In order that the products of excitation may be quickly and completely consumed, the powerful group of expiratory muscles must have some resistance against which they can exert themselves strongly and at the same time provide for adequate respiratory exchange.
It has already been many times urged that when breathing is satisfactory, breath does not escape to any considerable extent into the mouth cavity, but that the expiratory blast is used to set the air of the resonance-chambers into vibration.
In the case of the expiratory pressure of five units of strength being "controlled" by an inspiratory contraction of four units, nine units of strength are exerted, and the same result could be obtained by the exertion of one unit. There is a clear waste of eight units of strength.
The sudden air pressure exerted on the interior walls of the larynx by the expiratory contraction causes the ventricles of the larynx to expand by inflation. This inflation of the ventricles brings their upper margins, formed by the false vocal cords, into contact. Thus the opening from the larynx into the pharynx is closed.
No energy of condensation is left in the expired air the instant it has passed the vocal cords. Beyond that point there is no expiratory pressure. In one sense it is true that the expiration is "controlled" in tone-production. But this control is strictly an automatic action.
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