LUNGS, a motor for the voice, 6; illustrated, 24; described, 25; overcrowding, 31. MACKENZIE, DR. MORELL, on the laryngoscope, 3; on singing and speaking, 17. MACREADY, WM. CHARLES, as a good speaker, 16. MARTEL, voice of, at seventy, 4. MAXILLARY SINUSES, 7, 8, 12. MAY, DR., breathing tests made by, 26. MCKINLEY, M.S., on Garcia and the laryngoscope, 2. MENTAL DISCORD, a deterrent to beautiful singing, 84. MEYER, EDMUND J., on resonance, 43. MILLS, DR. WESLEY, on breath measure, 30; on ease of vocal action, 56; on the function of the ear in tone production, 57. MOTOR OF THE VOCAL INSTRUMENT, 6. MOUTH, theory of its function, 1; a resonator for the voice, 6. MUSCLES OF RESPIRATION, 23. MUSIC TEACHERS, scientific, 4; empirical, 4. NASAL CAVITIES, as reinforcing agents in tone production, 2; a resonator for the voice, 6; illustrated, 7; formation of, 8; vibrations in, 8; effect on resonance, 12; Edward Everett's use of, 16; as a resonator, 52, 53; obstruction of, in Booth, 53. NASAL RESONANCE, erroneous theories concerning, 1, 2; Madame Rudersdorff recognized effect of, 2; involved in head resonance, 52; versus nasal tone quality, 53; Lilli Lehmann on, 54; Sembrich's study of, 54; importance of, 54. NATURAL VOICE, what is meant by, 77. NERVOUSNESS, a cure for, 27, 80. NOSTRILS, relation of, to tone quality, 14. O-sound, lip position for, 20; illustrated, 21; in exercises, 59, etc. OO-sound, lip position for, 20, 21; in exercises, 59, etc. OPEN TONES, 2, 5. ORAL SURGERY, 2. ORATORIO, faulty diction in, 18. OVER-CONSCIENTIOUSNESS, a deterrent to beautiful singing, 84. OVERTONES, 45, 46. PERSONALITY, effect on the voice, 83. PHARYNX, function of, 10. PHILLIPS, ADELAIDE, voice of, in declining years, 4. PITCH OF TONE, influence of resonance cavities on, 12, 13. PLACING THE VOICE (see _Tone production_). POWER OF TONE, dependent on resonant cavities and breath control, 27. PRINCIPLES ADVOCATED, 5. PRONUNCIATION, indifference of American singers to, 17; W.J. Henderson on, 18; change of attitude toward, 18; importance of, to singer, 18; relation of, to tone, 18; Ffrangcon-Davies on, 18; sing words rather than tones, 18; Lilli Lehmann on, 19; emotional power impossible without, 19; Gounod on, 19; Forbes-Robertson on, 19; upper lip in, 19; effect of smile on, 19. PSYCHOLOGY OF VOCAL CULTURE, 82-85. PTERYGOID MUSCLES, and the under jaw, 10. PUBLIC SCHOOLS, voice training in, 78. REEVES, SIMS, voice of, 4. REGISTERS, 38-42; blending the, 2, 41; not a natural feature of the voice, 2; fallacy of theory of, 2; a myth, 5; the _bete noire_ of vocalists, 38; defined, 38; Clara Kathleen Rogers on, 38; Lilli Lehmann on, 39; Ffrangcon-Davies on, 39; of the organ, 40; of voice and instruments compared, 40, 41; an artificial creation, 41, 42. REPOSE, AS A PREPARATION FOR VOCAL EXERCISES, 80; how to induce, 80.