=_RELATION OF THE PROPER USE OF THE VOICE TO HEALTH._=
Many years of observation and study have convinced me that the voice exerts a powerful effect upon the whole physical system. It either builds up the body, sustains its power and adds to its health, or it devitalizes the body and brings a dangerous strain upon the entire system.
The voice cannot be a reporter of the person, mental and physical, without holding the most delicate relations to mind and body. The exercise of the voice subtly and vitally affects the organs that promote health and give life. I could give many illustrations showing that the wrong use of the voice has injured health, and that its right use has promoted health; but if the principles involved in this chapter are fully understood, I need not relate incidents to prove that the voice is a life-giver or a death-dealer, depending entirely upon _how_ it is used.
The Greeks were taught the right use of the voice as a part of their physical, intellectual, and moral culture. In modern times we have neglected voice culture to a very great extent, and have suffered much ill health in consequence.
_RELATION OF THE PROPER USE OF THE VOICE TO THE VITAL ORGANS._
Great wisdom is exhibited in the construction of the human lungs. In the arrangement of the air cells, the greatest possible amount of surface is presented in order that the air may freely enter the blood. The lungs are largely made up of blood vessels, bronchial tubes, and air cells. When a person breathes, the oxygen, entering the lungs through the trachea and the bronchial tubes, penetrates the thin walls of these cells and passes at once into the blood. When the blood enters the lungs it is dark in color, but when it leaves the lungs it is of a light vermilion hue. The oxygen which has been taken into the lungs has wrought this change. So wonderful is this element of nature that some have called it life. If there is an elixir of life in the material world surely it is oxygen, for it has to do minutely and intimately with every power of the human body. The more a person breathes this oxygen as it is mixed in the common air, the more life and power he possesses.
It is essential to perfect health that every avenue to the lungs should be kept open and free, and that the air cells should be kept clear, for if the walls of the cells thicken, oxygen cannot penetrate them. If these cells are not properly filled during respiration, the walls thicken, and substances collect in the cells. If any trouble occurs in the air cells, except for traumatic reasons, it will first be found in the apexes of the lungs. In the production of tone, whether on a low, high, or medium pitch, the vocal cords are drawn so closely together that the air cannot immediately escape from the lungs; therefore, unable to get out readily, it is pressed up into the apexes of the lungs by the expiratory muscles, filling the air cells to the utmost, thus keeping them clear and their walls thin and healthy. In correct singing or speaking, the apexes of the lungs are filled with air. Tubercule seeks devitalized tissue for its development. Therefore tuberculosis usually begins in the apexes of the lungs because they are not kept clear and healthy through proper respiration and vocal exercise. Voice was given to man to make him strong and expressive, to give him life and power.