To say that no other style of breathing excepting that which has been described as correct, the mixed costal and diaphragmatic, ever should be employed, would be a mistake, but any other should be employed, when at all, only for rare and specific effects. For example, a tenor in reaching for a high note may find that the violent raising of the collarbone and shoulder-blades, which is involved in clavicular breathing, assists him at the critical moment, and he may, rightfully, perhaps, employ that method in that one great effort of an evening--remembering, however, that Rubini actually broke his collarbone in delivering a very high note. Tenors sometimes reach for their high notes with their arms and legs, and if the high note comes out all right, we forget the effort in the thrill over the result, provided effort does not degenerate into contortion. Similarly in an unusually powerful, explosive _fortissimo_, a momentary use of pure abdominal breathing may be excusable. But these are exceptions that prove the rule, and very rare exceptions they should remain. In breathing, the correct method of inspiration is to provide the room required for the inflation of the lungs by enlarging the chest-cavity to its greatest possible extent, which is accomplished by expanding the whole framework of the ribs and allowing the diaphragm to descend, the clavicle rising passively while the wall of the abdomen at first extends and then, as to its lower anterior portion, slightly sinks in. Sir Morell Mackenzie recognized that artistic inspiration is a combination of methods. "When costal or diaphragmatic breathing is spoken of," he writes in "Hygiene of the Vocal Organs," "it must always be remembered that in the normal human body both methods are always used together, the one assisting and completing the other. The terms are in reality relative, and are, or should be, applied only as one or the other type predominates in an individual at a given time." The only trouble about applying these terms singly to genuinely artistic breathing is that, in the nomenclature of respiration, they signify methods that are only partial, whereas correct inspiration is mixed costal and diaphragmatic, with a touch of the clavicular added. Such, then, is that "natural" method which also is artistic. It is based on sound physiological laws; and because these laws are, in turn, founded on fact, it is as efficient in practice as it is correct in theory. CHAPTER IV ON BREATHING: EXPIRATION