The author has always been of opinion that those who have investigated and written on this subject have devoted insufficient attention to one point--viz., the manner of using the breath. The breathing in the use of the high falsetto, for example, is as different as are the laryngeal processes; and this is a point of practical importance, for the voice-user must ever consider economy in breathing. It is expenditure in this direction that most taxes all singers, even the best trained and the most highly endowed. But the student, deeply impressed with the importance of the subject of registers, may ask: "How am I to distinguish between one register and another? How am I to know when I am singing with chest, middle, or head voice?" The answer is: "By sensations"--chiefly by hearing, but also by certain sensations (less properly termed "feelings") in the resonance-chambers and to a certain extent in the larynx. Of course, before one can thus identify any register, he must have heard a singer of fairly good voice form the tones of this particular register. One who has never heard sounds of a particular color or quality cannot, of course, learn to recognize them from mere description, though by this means he is often _prepared_ to hear, and to associate clear ideas with that hearing. As the registers are of such great practical importance, especially for the female voice, there is no period when it is of so much value to have a lady teacher as just when the voice is being "placed"--which should mean the recognition of its main quality, and the teaching of registers by imitation as well as description. The student should be made to understand, by practical examples, the subject of "covering," or modification. Certainly, the training of a vocalist cannot be adequately undertaken by even the most learned musician, however good an instrumentalist, if he has paid no attention to the voice practically. Much of the teaching done by those ignorant of voice-production, however well meant, may be a positive drawback, and leave the would-be singer with faults that may never be wholly eradicated.