Imitation furnishes the only means of acquiring the correct vocal action. Several authorities on the voice admit the value of imitation, even though they also make much of the mechanical doctrines of modern methods. Sieber gives imitation as the best means of curing faults of production. "The best means to free the student of the three forms of faulty tone just described is possessed by that teacher who is able to imitate these faults with his own voice." (_Vollstaendiges Lehrbuch der Gesangskunst_, Ferd. Sieber, 1858.) Dr. Mills goes further and advocates the imitating of finished singers for the purpose of acquiring the correct vocal action. "The author would recommend all students who have begun a serious practical study of the registers to hear, if possible, some singer of eminence who observes register formation strictly." (_Voice Production in Singing and Speaking_, Phila., 1906.) Kofler even declares that imitation is an indispensable element of instruction. "It is just as difficult or impossible to learn to sing good tones without hearing the teacher's pure model tone as it is difficult or impossible to learn to speak without hearing." (_The Art of Breathing_, Leo Kofler, 1889.) If the correct vocal action is to be acquired by imitation, of what use are the mechanical doctrines of vocal management? Kofler seeks to combine these two forms of instruction. "Physiological theories must go hand in hand with the musical ear or the law of imitation." Scientifically considered, this attempted combination of mechanical vocal training and instruction by imitation is an utter absurdity. There is no possibility of connection between vocal imitation and mechanical vocal management. Reliance on the imitative faculty involves the utter rejection of the mechanical idea. Compromise, or combination of the two, is a logical absurdity. Imitation and attempted mechanical management of the voice are absolutely incompatible. Any attempt consciously to direct the muscular workings of the vocal organs is an interference with the normal action of the voice. So soon as conscious mechanical management of the voice is attempted throat stiffness results, and the voice is hampered in the exercise of its instinctive faculty of imitation. It is impossible to acquire the correct vocal action by the application of mechanical rules, because a consistent following of mechanical doctrines utterly prevents the vocal organs from operating normally, even though the student try at the same time to guide the voice by the sense of hearing.