Chapter 5

It is possible, of course, to limit these movements to a minimum, but a teacher who insists upon his pupils keeping their voice-boxes perfectly still commits a serious mistake, because it is always injurious to do violence to nature. It is one thing to keep the voicebox steady, thereby facilitating the working of some of those muscles which act immediately upon the vocal ligaments; it is quite another thing, as will be seen below, to attempt to prevent movements which have to serve a great purpose.

In _whispering_, the voicebox occupies a different position in the throat for each vowel. I invite the reader to try the following curious experiment. Let him take the larynx gently between the thumb and the first finger, and then _whisper_ OO (as in "food,") OH, AH, A (as in "name,") and E (as in "bee"). He will find that the voicebox rises with every succeeding vowel until at last it has completely slipped away from between the finger and thumb. Each one of these _whispered_ vowels has, as first ascertained by Helmholtz, its exact pitch, whether uttered by a little child or by an old man, and the effect of the rising of the voicebox is to shorten the resonator, whereby the raising of the pitch is produced.

I stated on page 41 that the vocal ligaments were capable of being stretched by the ring-shield muscles, and that the pitch of the tones produced by their vibrations depended mainly on their tension. As we are now taking note of such movements of the voicebox as may be either seen or felt in the throat, we will take the opportunity of trying whether my statement can be verified. Let the reader, therefore, do as follows:--(1) Place the finger on the shield cartilage, and press it vigorously backward. (2) Sing loudly any high tone that is well within your compass. Hold this tone steadily, and _be quite sure you do not alter its pitch_. (3) Now suddenly remove your finger, continuing to sing as before. What is the result? Your tone is raised by a third, or even more, according to the amount of pressure you exercised on the shield. And how did this result come about? In this way: By pressing the shield backwards you elongated the ring-shield muscles, thereby counteracting their stretching influence, and at the same time slackening the vocal ligaments. The tone you sang while doing this was, we will say C'. By releasing the shield you enabled the ring-shield muscles to contract again, thereby putting the vocal ligaments on the stretch as they were at first. That changed your C' to E', or higher still. Have I proved my assertion?

Now one more test, if you please. I pointed out to you on page 34 an opening between the shield and the ring. You will see it on plate V, No. 10. Please sing a low tone; place your finger gently on the shield, and move it downwards. You will soon discover a little hollow which corresponds with the opening I just mentioned, and into which you can easily put part of the tip of your finger. Now sing up the scale, and take care to keep the tip of your finger in the hollow. Remember that in singing up the scale your voicebox will rise, which movement you must follow, or you will lose the place. If you do this carefully, you will find that the hollow gets smaller and smaller by degrees until at last it closes entirely, and you can no longer find a trace of it. Now sing down again, keeping your finger on the same spot. You will soon notice the hollow again, and it will continue to get larger and larger until you arrive at the bottom of your scale.

This, of course, is but another way of showing the mechanism by which the pitch of your tones is raised or lowered, and we have proved the same thing by our preceding experiment. But I asked you to try this chiefly because it will enable you to put a check upon my statements with regard to the registers of the voice, a subject which I propose to discuss in another chapter.

THE LARYNGOSCOPE, AND HOW TO USE IT.

The Laryngoscope in its simplest form is a thin circular mirror, about three-quarters of an inch in diameter, set in a metal frame, and fastened at an angle of 120° to a piece of wire from three to four inches long, which is put into a small wooden handle not much thicker than a pencil, and about the same length as the wire. By help of the laryngoscope we can either see our own larynx or that of another person. The easiest experiment is upon the larynx of some one else. In this case, the person to be operated upon sits facing the sun, the head slightly bent backwards, and the mouth wide open. If he has not sufficient control over his tongue to prevent it from arching up, he must gently hold its protruding tip with a pocket handkerchief between his thumb and forefinger. The mirror is now slightly warmed to prevent its becoming dimmed by the moisture of the breath, and then, holding it like a pen, the operator introduces it into the throat so that it touches the uvula. This must be done lightly yet firmly, care being taken not to bring the mirror into contact with the base of the tongue. The rays of the sun falling upon the mirror are reflected downwards into the voicebox, the image of which is clearly visible in the mirror. In making observations upon oneself, a second mirror in the shape of an ordinary hand looking-glass is necessary to reproduce the image in the small mirror. This is the way in which the renowned professor of singing, Senor Manuel Garcia, made those famous "Observations on the Human Voice," communicated to the Royal Society by Dr. Sharpey, on May the 24th, 1855. Similar attempts had been made before; for instance, in 1827 by Babington, in 1838 by Baumès, in 1840 by Liston, and in 1844 by Warden and Avery. But they had all ended in failure, an occasional glimpse of some parts of the voicebox being the only result obtained. Garcia, however, brilliantly succeeded where all his predecessors had failed, and was the first not only to see the vocal ligaments, but to see them in the act of singing, and to see them so clearly as to be able to give an account of their minutest movements. The instrument has since been greatly improved, and the process of investigation has become a science. Medical men all over the world have laid hold of it, and suffering humanity is daily benefited by it. But Garcia is the man who produced the first results, and to him, therefore, is due the credit of being practically the inventor of the laryngoscope.

It is almost incredible, but it is true, that this splendid invention was received coldly and with distrust in this country, and had it not been for Dr. Johann N. Czermak, Professor of Physiology at the University of Pesth, the matter would, in all probability, have been forgotten. But this gentleman recognized the value of Garcia's invention, and he at once went enthusiastically to work, and pushed on vigorously in the way which Garcia had opened for him. He constructed an apparatus which enabled him, by making use of artificial light, to work without interruption and without waiting for the sun to shine. He then made his first attempts on himself in order to become acquainted with the conditions which have to be fulfilled by the observer as well as by the person to be operated upon. In this way he soon became a master of the new process, which he immediately brought under the notice of the profession by giving lectures and demonstrations in the chief towns of Europe.

More than twenty years have passed since then, and the laryngoscope has, during that time, been made excellent use of, not only for the alleviation of suffering, and the cure of disease, but also for its original purpose--_i.e._, the exploration of the mechanism of the human voice.

My own connection with the matter has arisen through my desire to sift contradictory statements made by various observers. Having read many English, German, and French books on the subject, I was in position to pick up a hint here, and to get some good advice there, and the consequence was that I was able to pursue a course which made me familiar with the use of the laryngoscope in a very short time. As my experience may be useful to others, I will briefly relate how I proceeded.

I made my first attempts upon a skull, to which I attached a plaster-of-Paris model of the voicebox, the whole being fastened to an iron stand. The instrument I used was a concave reflector on a spectacle frame. The reflector had a hole in the centre, and was capable of being moved in various directions. The next thing was the little mirror described on page 73, and lastly, a gas lamp on the principle of the well-known "Queen's" reading lamps, which can be raised or lowered at pleasure. I placed the skull to the left of the lamp, and looking with my right eye through the hole in the centre of the reflector, practised throwing the light swiftly and with certainty into the upper part of the throat. I then introduced the little spy mirror, and tried to see and to recognize the various parts of the voicebox, which, let it be remembered, present a somewhat different appearance in the looking-glass from what they do if seen without it. Then I got a friend to mark my artificial voicebox, unknown to me, in various ways, and endeavoured quickly to discover what he had done. In this way I soon acquired a considerable amount of skill in handling the instrument, and also became thoroughly familiar with the image of the voicebox in the mirror.[M] Having thus to a large extent mastered the mechanical part of my work, I proceeded to make observations upon myself. I placed to the left of the lamp an ordinary bedroom looking-glass, in which now appeared my own face instead of the skull which hitherto occupied this place. I opened my mouth, and by the help of the reflector directed the light into the image of it in the looking-glass. I then continued in every way as I had done with the skull, with this difference, however, that I had first, as pointed out before, to warm the little spy mirror in order to prevent its becoming dimmed in the throat.

An instrument has since been designed by the late Dr. G. D. Foulis, of Glasgow, which for simplicity, general excellence, and cheapness, far surpasses the above contrivance, and which I strongly recommend to intending students of laryngoscopy. It consists of a plain stand on which is placed a glass globe filled with water, the whole being surmounted by a small square mirror. The rays from a lamp or candle, placed behind the globe, are concentrated into the open mouth of the observer, who is seated in front of it, enabling him, by the use of an ordinary throat mirror, to inspect the movements of his own vocal ligaments.

This apparatus, as shown in the annexed drawing, including a throat mirror, and safely packed for transmission, may be had from Messrs. W. B. Hilliard & Sons, 65, Renfield Street, Glasgow, for the very small sum of 7s. 6d.

Let not the reader who tries laryngoscopic investigations be discouraged if, at first, violent retching is the result. It does not so much arise from sensitiveness of the parts touched, as from awkwardness in introducing the mirror. If he perseveres he will soon be rewarded by a view of the pearly white vocal ligaments, and a little repeated practice upon himself will enable him also to operate upon others without causing them discomfort.

I close this chapter by again reminding amateur laryngoscopists that in the vast majority of cases where the touch of the mirror causes retching and gagging, it is due less to the sensitiveness of the person operated upon than to the want of skill on the part of the operator. He should in that case renew his experiments upon himself, and continue them until he has fully mastered the use of the instrument, as it is not fair to make others suffer for his own clumsiness.

THE TEACHINGS OF THE LARYNGOSCOPE.

On introducing the mirror into the throat we first see the back part of the tongue, which has a very uneven surface, and which is, as a rule, covered with greyish phlegm. We next notice a hollow space between the tongue and the lid, which is divided by an elastic band forming a little bridge between the two. Next comes the upper free part of the lid, the shape of which greatly varies in different individuals. It hangs over the voicebox, which it almost completely hides from view; but during the production of a high tone on the vowel A, as in "sad," it takes an almost perpendicular position. When the lid is so raised (pl. XIV, L) we can see right down to the bottom of it, where we observe that it bulges out a little. Extending from either side of the lid to the pyramids are two folds of mucous membrane, in the hinder part of either of which are to be observed two little elevations representing the cartilages of Santorini (pl. XIV, S S), and the upper points of the wedges, called the cartilages of Wrisberg (pl. XIV, W W). Looking down the kind of tube which is formed by the parts just enumerated, we next notice two horizontal projections running from front to back, which are the pocket ligaments (pl. XIV, P P). Everything we have seen so far is of a pinkish colour. Below the pocket ligaments, right at the bottom of the tube described above, we see the main object of our investigation, namely, the vocal ligaments (pl. XIV, V V). These, being almost of a pearly white, form a strong contrast to all their surroundings, and it is quite impossible to mistake them.

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In quiet breathing the vocal chink is of a triangular shape, of which, however, we can only see the hinder part, the front part being hidden by the lid (pl. XIII). In exaggerated efforts at breathing this space gets considerably larger, so that, with a well-directed light, we can see into the windpipe, of which the rings are plainly noticeable. It is even possible to see the lowest part of the windpipe, where it is divided into the two branches entering the lungs.

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For the purpose of studying the movements of the vocal ligaments in the act of singing, the vowel A, as in "sad" will be found the most favourable, because the formation of the mouth, and the position of the tongue which it necessitates, enable us to get a complete view of the interior of the voicebox, which during the emission of other vowel sounds is more or less hidden.

Mr. Lunn objects that all investigations with the laryngoscope are valueless on account of the supposed necessity of holding the tip of the protruding tongue. He says, in a letter to the "Orchestra" (January, 1880): "One of our most promising singers told me he could not rightly produce his voice when under laryngoscopic investigation. It is a moral impossibility for all!" (A physical impossibility would be more to the purpose.) "Let the reader pull his tongue out with a napkin as far as he can, and sing, and he will get some notion of the tone producible." There is no foundation for this objection, because if a singer has his tongue under proper control there is not the slightest occasion to put it out and to hold it. As to pulling it out as far as one can, that should not be done under any circumstances, and no man having the slightest knowledge of laryngoscopy would suggest such a ridiculous proceeding. In my own case the vocal ligaments can be seen from one end to the other while I keep my tongue in its natural position, and I am willing to demonstrate this fact to any one who has any doubt in the matter.

As soon as we produce a tone, the pyramids, and with them the vocal ligaments, meet, so as to touch each other more or less closely, while there still remains a large space between the pocket ligaments above. Every time we take breath, the pyramids with the vocal ligaments recede, to meet again as before, every time we strike a new tone. The vocal ligaments, thrown into vibrations by the stream of air passing between them, cut, as it were, this stream of air into regular waves, and thus (as more fully explained on p. 38) tone is produced.

We notice here that this tone-production may be originated in three different ways:--(1) The vocal ligaments may meet _after_ the air has commenced to pass between them. Of this an aspirate is the result. (2) The vocal ligaments may meet _before_ the air has commenced to pass between them. This causes a check or a click at the beginning of the tone. (3) The vocal ligaments may meet just at the very moment when the air passes between them. In this case the tone is properly struck. There is nothing to make it indefinite as in case No. 1, and nothing to impede it as in case No. 2. Production as in case No. 3 causes the tone to travel much farther than production as in cases Nos. I and 2, and it is this way of striking a tone which is known under the name of "Coup de Glotte" or "Shock of the Glottis."

"But it is not a shock of the glottis at all," says Mr. Lunn, on page 68 of the book quoted before. "It is an audible result arising from the false cords [pocket ligaments] releasing condensed air imprisoned below them, which air in its release explodes." I beg leave to observe that condensed imprisoned air thus released could produce a puff, but not a musical tone. The matter is, moreover, capable of being demonstrated to the eye. The process takes place as described above, and I am ready at any moment to show that the pocket ligaments _never_ meet in singing. There can, therefore, be no possibility of condensed air being imprisoned below them, and we need not enter into any further argument on the subject.

We now proceed to study the Registers of the human voice. A very Babel of confusion exists on this important subject, and we are not only perplexed by a multiplicity of terms, but also by the various and often contradictory meanings attached to them. Thus people talk of chest, medium, mixed, throat, falsetto, and head registers, and these terms being utterly unscientific--_i.e._, being based upon sensations and fancies instead of physiological facts--no one can give a clear and satisfactory definition of any one of them. To bring order into such chaos is an almost hopeless undertaking, and the first step in this direction is obviously to ask ourselves, What is the meaning of the word "Register?" My reply is this: _A register consists of a series of tones which are produced by the same mechanism_. Then comes the question, Can any such registers be demonstrated in the vocal apparatus; and if so, what are the mechanisms by which they are produced? The answer supplied by the laryngoscope is, Yes. There are, broadly speaking, three registers in the human voice, and the mechanisms are plainly visible, as follows:--(1) During the lowest series of tones the vocal ligaments vibrate in their entire thickness (pl. XIV). (2) During the next series of tones the vocal ligaments vibrate only with their thin inner edges (pl. XV). (3) During the highest series of tones a portion of the vocal chink is firmly closed, and only a small part of the vocal ligaments vibrates (pl. XVI).

In accordance with these physiological facts, Mr. Curwen, in his admirable book "The Teacher's Manual," calls the registers _the Thick_, _the Thin_, and _the Small_. These names have a scientific basis, and their meaning cannot be misunderstood. They are already familiar to thousands who study music by Mr. Curwen's method, and I have myself made use of them in my lectures at University College and at other places. I shall, therefore, also adopt them in this little work, and hope they will soon find general acceptance among teachers and learners, as thereby a great many misunderstandings will be avoided.

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Our next business will be to ascertain how these registers are divided among various voices, and the result as revealed by the laryngoscope is rather startling. It consists in this, that the break between the Thick and Thin occurs _in both sexes_ at about [Illustration: musical notation] In order to realize the full meaning of this, the reader must bear in mind that music for tenors is generally written an octave higher than it is sung, so that the tones we are now speaking about would, as a rule, in a tenor part be expressed by [Illustration: musical notation]. My assertion, therefore, amounts to this, that everything below [Illustration: musical notation] whether sung by soprano, contralto, tenor, or bass, is produced by one mechanism--that is to say, by the vocal ligaments vibrating in their entire thickness; and that the series of tones above [Illustration: musical notation] whether sung by bass, tenor, contralto, or soprano, is again produced by one mechanism (although a different one from the last), that is to say, by the vocal ligaments vibrating only with their thin inner edges. Then there remains the small register, which belongs almost exclusively to sopranos, and which represents the series of tones above [Illustration: musical notation].

I thus maintain, not only that the great break between the thick and the thin occurs (individual differences apart) at the same place in both sexes, but that (leaving for the moment sub-divisions out of consideration) the male voice has but two registers--_i.e._, the Thick and the Thin, while the female voice has three registers--_i.e._, the Thick, the Thin, and the Small. From this it follows that the female voice is _not_, as supposed by some, simply a reproduction of the male an octave higher.

I have spoken of the above results of the investigations with the laryngoscope as startling, because the female voicebox is generally imagined to be exactly like the male, save in size, and the inference that the female voice must be exactly like the male, save in pitch, is, therefore, a very natural one. Neither am I surprised that those who hold an opposite view to mine are never tired of advancing this argument.

Mr. Lunn says, in the book quoted before, on page 24, "Consequently it may safely be asserted that the vocal cords are subject to the same laws as all sounding bodies, and as the sole difference between the male and the female larynx is one of size alone, the voice from the latter _is_ a reproduction of the former on a higher scale."

I have, however, shown by the measurements of Luschka, on p. 64, that the proportions of the female voicebox are materially different from those of the male, and I have also pointed out differences in shape noticeable to any observer. Now, although I do not pretend that I have by these facts and figures sufficiently accounted for the difference in the registers of the male and the female voice; yet these facts and figures are nevertheless greatly in my favour, and they are certainly a sufficient answer to the above argument of those who differ from me.