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. * * * * * 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.