Had I not been a singer before I became a physician, I might not realize the part that nature, properly guided, plays in the use of the voice. Had I remained a singer and not become a physician, I might not realize how important an aid in properly guiding nature in the use of the voice is a scientific knowledge of the action of the voice-producing organs. Had I not been a singer and were not now a physician, I might not realize the influence upon the artist's physical well-being, and especially upon that delicate apparatus, the voice-mechanism, of temperament, mental condition and other purely metaphysical factors. This book, then, while it believes in consulting nature, does not believe in that "natural" method which simply tells you to stand up and sing; nor does it believe in that physiological method which instructs you to plant yourself in front of a mirror and examine your throat with a laryngoscope; nor in advising you to follow minutely the publications of the Society for Psychological Research. It believes in a synthetic coördination of the three. In my practice I have become convinced that every impairment of the voice is due to outraged nature, resulting in a physiological condition of the vocal organs that should not exist, and, in turn, inducing a psychological condition, such as worry and despondency, which also should not exist. By discovering with the aid of the laryngoscope the physiological defect and removing it, body, and, with it, mind and voice are restored to their proper condition. But if the singer goes back to a teacher whose method is wrong, the same impairment, or even worse, will result. Jean de Reszke is a perfect example of how a singer can develop his voice when he turns from a wrong method to a right one. This celebrated tenor actually thought he was a baritone, and so did his teacher. He was trained as a baritone, made his début in a baritone rôle and sang as a baritone for several years. But he experienced great fatigue in singing, much greater fatigue than seemed proper or necessary. This led him eventually to have his voice tested by another teacher, who discovered that he was a tenor. Singing with the wrong voice, which also means with a wrong method, had exhausted him. As a tenor his beautiful voice-production, based on a correct physiological method, made him equally at home and equally at ease in rôles making the most opposite demands upon his powers. He sang equally well in Gounod and Wagner; and in Wagner, whether he was singing the young Siegfried, Siegfried of "Götterdämmerung," or Tristan.