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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.
The author holds to-day, as he did when he published his results many years ago, that "Impressions from general laryngoscopic observations or conclusions drawn from single cases will not settle these questions.
There are possibly a half score of cases recorded, but this anomaly is very rare, and Major is possibly the only one who has to a certainty demonstrated the fact by a laryngoscopic examination. By the laryngoscope he was enabled to observe a paroxysm in a woman, in which the tongue retracted and impinged on the epiglottis, but quickly recovered its position.
Intended to illustrate the optical principles involved and the practical method of carrying out laryngoscopic examination. As usually employed, the laryngoscope consists of two mirrors, the head-mirror, so called because it is usually attached to the forehead by an elastic band, and the throat-mirror, which is placed in the back part of the mouth cavity.
Stockhausen's mention of this fact has already been noted. This fact tends to cast some doubt on the value of laryngoscopic observation as a means of determining the laryngeal action. Under the conditions necessary for examination with the laryngoscope it is impossible for the singer to produce any but soft tones in the head quality of voice.
A stay at Ems did him no good, Doctors Tobold and von Bergmann, the leading specialists of the day, were consulted, a laryngoscopic examination followed, the presence of cancer was strongly suspected, and an operation was advised.
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.
Garcia describes how the larynx is raised and lowered in the throat, according to the register in which the tones are produced. He also notes the position of the tongue and the soft palate. Widespread interest was awakened by the account of Garcia's laryngoscopic investigations of the registers, published in 1855.
No doubt there is some difference between the muscular actions of correct tone-production and those of any incorrect operation of the voice. But the nature of this difference in muscular action has never been discovered by means of dissections of the larynx, nor by laryngoscopic observation. The Acoustic Principles of Tone-Production
Most of these tones, if swelled to forte, would change from the head to the chest quality. It is probable that this change in quality is effected by a corresponding change in the vocal cord adjustment, as the conditions of the resonance cavities remain the same. But this cannot be determined by laryngoscopic observation.
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