Can any empirical knowledge of the voice be obtained by the mere listening to voices? If so, we ought now to be in possession of any facts which might be thus observed. Is it possible that information of this character is already a common possession of the vocal world, and yet that this information has never been applied in the investigation of the voice? This is exactly the case. Many facts regarding the voice have been observed so continually that they are a matter of common knowledge, and yet these facts have never been recorded in a scientific manner. Consider, for example, this remark about a famous singer, made by one of the foremost musical critics of the United States: "Mme. T---- 's lower medium notes were all sung with a pinched glottis." How did this critic know that the singer had pinched her glottis? He had no opportunity of examining her throat with the laryngoscope, nor of observing her throat action in any other way. In fact, the critic was seated probably seventy-five feet from the artist at the time the tones in question were sung. The critic had only one means of knowing anything about the singer's throat action, and that was contained in the sound of the tones. There must therefore have been something in the sound of the tones which conveyed this information to the critical listener. For many years this gentleman had been in the habit of listening closely to singers, and he had found some way of estimating the singer's throat action by the character of the tones produced. This same means of judging the manner of production from the sound of the tones seems to have been utilized nearly two hundred years ago. Speaking of the most frequent faults of tone-production, Tosi remarks: "The voice of the scholar should always come forth neat and clear, without passing through the nose or being choked in the throat." Mancini also speaks of the faults of nasal and throaty voice: "Un cantare di gola e di naso." A throaty tone, therefore, impressed these writers as being in some way formed or caught in the singer's throat. It may be set down as certain that no pupil ever explained to either of these masters how the objectionable sounds were produced. How then did Tosi and Mancini know the manner in which a throaty tone is produced?