Under the influence of the idea of mechanical vocal management there is little room for choice between voice culture along empirical lines, and the accepted type of scientific instruction. Modern empirical voice training has little practical value. Describing to the student the sensations which ought to be felt, does not help in the least. Even if the sensations felt by the singer, in producing tone correctly, are entirely different from those accompanying any incorrect use of the voice, nothing can be learned thereby. The sensations of correct singing cannot be felt until the voice is correctly used. An effect cannot produce its cause. Correct tone-production must be there to cause the sensations, or the sensations are not awakened at all. Nothing else can bring about the sensations of correct singing, but correct singing itself. Further, these sensations cannot be known until they are actually experienced. No description is adequate to enable the student to feel them in imagination. And, finally, even if the sensations could be described with all vividness, imagining them would not influence the vocal organs in any way. This is true, whether the description is given empirically, or whether it is cited to explain a mechanical feature of the vocal action. Instruction based on the singer's sensations is absolutely valueless. It would seem that modern methods contain very little of real worth. The investigation of the mechanical operations of the voice can hardly be said to have brought forth anything of definite value to the vocal teacher. But this is not the worst that can be said about the mechanical doctrines of tone-production. When critically examined, and submitted to a rigid scientific analysis, several of these doctrines are found to be erroneous in conception. These are the theories of breath-control, chest resonance, nasal resonance, and emission of tone. It will be observed that these doctrines comprise more than half of the materials of the accepted Vocal Science. Yet notwithstanding the fact that they are accepted without question by the great majority of vocal theorists as important elements of instruction in singing, each of these doctrines involves a distinct misconception of scientific principles. An examination of these doctrines is therefore the next subject to be undertaken. CHAPTER II THE FALLACY OF THE DOCTRINE OF BREATH-CONTROL When Dr. Mandl advanced the statement that the laryngeal muscles are too weak to withstand the pressure of a powerful expiratory blast, the theory of the vocal action therein embodied met with immediate acceptance. This idea is so plausible that it appeals to the thoughtful investigator as self-evident, and seems to call for no proof. The doctrine of breath-control was at once adopted, by the most influential vocal scientists, as the basic principle of tone-production.