The extent to which one feels the annoyance of a small mirror held gently in the throat depends really on the amount of attention directed to it, and the degree of determination with which he resolves to exercise self-control. The author has examined an entire class of students of voice-production and found only one person who did not succeed in at once giving him a view of the larynx. But it must be at once said that of all persons examined by the author during his experience as an investigator of voice-production and in special medical practice, none have been able to show their throats, the larynx included, so well as speakers and, above all, singers; which in itself indicates that speaking and singing do give control of the throat--that all its parts respond to the will of the observed person. The author must further, however, remark that he has found this control associated not so much with vocal power as with intelligent study. Intelligence tells in music a good deal more than many people have yet learned to believe; but on this point the reader will long since have learned the author's views--in fact, so deep are his convictions on this subject that he hopes he may be pardoned for frequent reference to them, in one form or another. One anatomical fact may be so invincible that a view of the glottis cannot be obtained at all: the epiglottis may so overhang the opening to the larynx that a good view of its interior is absolutely impossible, in other cases only occasionally and under very favorable circumstances. Such cases are, however, of the rarest occurrence, while there are not a few persons in whom one may even see down the windpipe as far as its division into the two main bronchial tubes, and inflammation may thus often be traced from the vocal bands far down the mucous membrane common to the larynx, windpipe, etc. As has been remarked previously, it is only by the use of the laryngoscope that one can see the vocal mechanism of the larynx in action, so that for investigation laryngoscopy is essential. Auto-laryngoscopy, or the use of the laryngoscope by the subject to observe his own larynx, has its special difficulties and advantages, the greatest of the latter being, perhaps, that the observer may use himself as often and as long as he will, while he would hesitate to make observations on others at great length or with frequent repetition. There are no new principles involved in auto-laryngoscopy. The observer must simply see that a good light is reflected into his own throat, and that the picture in his throat-mirror is reflected into another into which he may gaze, an ordinary small hand-glass usually sufficing.