For ventilating and sweeping the lungs, for quick refreshment after fatigue, and for use always at the close of your exercises, inhale through the nostrils slowly a complete breath; hold two to four counts, purse the lips tightly and expel through them a small puff of air, hold two counts, puff one, hold two counts, puff one, and so on until the exhalation is complete. A few trials should convince you that this simple exercise is of great value. HALF-BREATH In both singing and speaking, the sustained delivery of long phrases or sentences sometimes makes unusual demands on the breath supply. It is a law of good singing that every phrase should end with the breath unexhausted. When the flow of text and music forbid the taking of a full breath, half-breaths must be quietly taken at convenient points. Instead of letting the whole reservoir of motive power exhaust itself and then completely refill it, we should, by taking these half-breaths, maintain a reserve. A notable advocate of the use of the half-breath in singing is that past mistress of sustained and smooth delivery, Marcella Sembrich. CHAPTER V REGISTERS The subject of registers has always been the _bete noire_ of vocalists, a source of controversy and confusion. The term "register," as commonly used, means a series of tones of a characteristic clang or quality, produced by the same mechanism. The term "break" is generally used to indicate the point at which a new register with sudden change appears. The advocates of registers lay stress either on the changes in laryngeal action, or the changes in tone quality. Before the days of the laryngoscope, registers were treated simply as different qualities of tone, characterizing a certain portion of the voice's compass. Those who encourage the cultivation of register consciousness claim to do so for the sake of the differences in tone-color which they associate with the different "registers." The purpose of the following chapters is to show that the quality or color of a tone is altogether a matter of resonance, and _not_ a question of laryngeal action. Moreover, the mechanism of the larynx is not voluntary in its action, but automatic, and even if a singer knew how the vocal cords should act it would not help him in the least to govern their action. The fact is that the results of laryngoscopic study of the vocal cords have been disappointing and contradictory and investigators have failed to define what correct laryngeal action is. There are those who even deny that the vocal cords govern the pitch of the voice.