The nature of the vibrations of the vocal bands, and, therefore, the character of the sounds produced, depend in no small measure on one thing, to which attention cannot be too carefully given. To a large extent the pitch, the volume, the quality, the carrying power, etc., of a tone depend on the adjustment now referred to--one of the facts which were, if not physiologically, at least practically recognized by the old Italian masters. Teachers everywhere felt the need of some technical term to express the adjustment we are considering, hence the expression _coup de glotte_, which is not in itself necessarily either incorrect or for other reason to be condemned. All depends on the sense in which it is used, as we have already said. It must, however, be admitted that it does; to most persons, convey the idea of something that is more or less violent as well as sudden, so that there seems to lurk in this term a tendency to mislead, to say the least. There really should never be a blow or shock of the glottis; the vocal bands should never strike together violently, or, indeed, strike together at all, in the ordinary sense of the term. They should, however, be approximated with considerable rapidity and with a perfect adjustment to the breath-stream, and this must be associated with a like perfect adaptation of the breath-stream to them through the harmonious working of the many muscles (neuro-muscular mechanisms) which constitute the most important part of the respiratory mechanism. In brief, the adjustment of the breathing and laryngeal mechanisms resulting in the adequate and suitable approximation of the vocal bands for tone-production constitutes the _coup de glotte_, or, as the author prefers to term it, the "attack."