A discussion of the use of special vowels and consonants in this class of exercises is contained in Chapter V. It must not be understood that this topic of instruction is assigned by many teachers to any particular period of the student's progress. Moreover, practice in the registers seldom forms the exclusive material of lessons and home study for any definite time. The wide range of topics considered in the average singing lesson has already been mentioned. Very little connection can be traced between the scientific doctrine of registers, and the treatment which this subject receives in modern methods. This is only to be expected, in view of the fact that laryngoscopic investigation has not resulted in practical rules for managing the vocal cords. The registers of the voice are handled by modern teachers in a purely empirical fashion. _Movements of the Larynx, Tongue, and Soft Palate_ It was remarked, in speaking of the registers, that no mechanical means has ever been found for directly controlling the operations of the vocal cords. To this statement one apparent exception is seen in the method originated by John Howard. This earnest student of the voice sought to carry out, to its logical conclusion, the accepted idea of mechanical vocal control. In this respect he stands practically alone. His is the only method which even pretends to reduce the entire operation of correct tone-production to a set of defined muscular contractions. Howard's theories, with the details of a practical method based thereon, are fully described in his most important published work, _The Physiology of Artistic Singing_, New York, 1886. A complete exposition of Howard's theories is not called for here. For the present purpose the following short summary will suffice: "The difference between correct tone-production and any incorrect vocal action is solely a matter of laryngeal adjustment and vocal cord action. Whether the tone produced be right or wrong, the influence of the resonance cavities is about the same. It is therefore idle to pay any attention to the subject of air resonance. Only one form of resonance is of any value in tone-production (considered as distinct from vowel formation). This is the sounding-board resonance of the bones of the head and chest. To secure this, the most important reinforcement of the tone, the larynx must be firmly held in a fixed position against the backbone, at the fifth cervical vertebra. All theories as to the registers of the voice, derived from laryngoscopic observation, are completely erroneous.