the proper development of his voice, that the weakness be strengthened as soon as it appears. It may be prevented by anticipating it with proper breathing and the exercises which require the action of the superior register for its basic part, but mostly in tones of the lower part of the superior register. This quality of tones may be brought down into the middle register to the tones B, A, and even G to advantage. As soon as the internal muscular controlling force from the tone A of the middle register to F of the superior register has returned to its normal condition through a natural growth, the child is ready to take up the study of the science of tone production as presented in the preceding chapters. With a child whose voice has been guarded until adolescence, the adjustment and the balancing of the voice are usually the im portant points in teaching him the science of tone production because in eliminating the break he has been asked to carry the tones of the high register below the natural condition. A similar trouble, only greater, is often met in the case of the natural artist. He sings the middle B, C, D differently when these tones are the highest than he does when they are the lowest of a composition. When the voice has matured and has been scientifically placed, each and every tone has but one adjustment and should be directly caused by the register and through the bronchia to which it belongs. QUESTIONS FOR TOPICAL REVIEW What is the usual cause of monotony in children's voices? What have you to say concerning a baby's tones? What is the quality of a child's voice? What is the cause of the high pitch in a child's voice? In what way are low pitch tones attempted by children? Why is whispering detrimental to the quality of the voice? What are the points of interest in the anatomical comparison of man's vital organs with those of lower animals? What inference in regard to man's voice can you make from the dropping of his vital organs? What is the natural cause of the break which takes place with the change of the voice? How should the break caused by the change of voice in a child be treated? How can the break be prevented? How should a child's voice be exercised to prevent or eliminate the break? When is a child in a condition to begin the study of the science of tone production? What are the most important points to observe in teaching the science of tone production to a child? CHAPTER XVIII HYGIENE The oral cavity and the appendages it contains have been added to the vocal organs proper for the articulation of musical tones. These organs are of great importance to the welfare of the Ego, for through them the first step in the process of digestion is taken. This is the special purpose for which Nature intended them; so it is by having this special purpose in view and the part they have towards the welfare of the general organism that we can assure their health and strength, as well as their entirety. The teeth should concern us the most, for it is not any too soon for civilized man to take notice that his descendant of the near future will be an edentate if he permits the modification of these organs to keep on at the rate it is now going. The typical set of teeth in man is fortyfour. The number has been gradually reduced. Thirty-two is the number now considered to be a complete set; but in the centers of high civilization half of the present generation have not the third molars. With many, the four second bicuspids are lacking and a few have not the superior laterals. This last reduction brings the number to twenty-two, exactly one-half the typical set. The depreciation in the texture, the increased percentage of organic matter in the remaining teeth, is still much more alarming than the reduction of the number. An adult possessor of a sound set of teeth is a cause of wonder now; while the skeleton of the cave-man shows that the teeth in |