As these methods of tone-production are of so much importance, it will be worth while to analyze them. It will be found that in each there is a characteristic use of the breathing mechanism. The larynx and the resonance-chambers are of course intermediate, as usual, between the breath-stream and the result, the tone; without them there could be no tones. But if the student have clearly in mind the memory of the tone he wishes to produce, including its various properties of pitch, volume, quality, etc., it will be found that the point requiring strict attention, in production, is the breathing, especially the manner of using the expiratory current. 1. The sustained tone requires an amount of breath proportional to its length, and the great aim in its production should be to convert, so to speak, all the breath into tone, as we explained in a previous chapter. This sustained tone, which may be practised with advantage on every one of the notes of a scale, is, in the nature of things, the very foundation of all good singing and speaking. 2. In the second and third exercises the differences in the method lie in the attack and the manner of using the breath. The smoothly linked tones are the more difficult for most people, since they require special control over the laryngeal mechanism and the breathing apparatus. Between the singing of a scale in this manner (_legato_), and as it is frequently done, there is the same difference as in walking up-stairs as does a perfectly trained ballet-dancer, and this act as carried out by a rough countryman, used only to ploughed fields, etc. For a perfect execution, the attack, while decisive enough, must be most carefully regulated, and the breathing, which is always to be considered in a good attack, must be of the most even character; the outflow requires the most perfectly controlled movements of the respiratory apparatus. In the other form of exercise (detached tones) there is often, at least, a little more emphasis on the attack, and the breathing is perhaps not always so even, but in some passages, in actual singing, the method employed for these less closely linked tones is in most respects the same as the last. 3. Very different from all the preceding is the mode of production usually designated by musicians _staccato_, _marcato_, etc. The tone is attacked suddenly, and as suddenly dropped, which, expressed physiologically, means that the entire vocal mechanism is rapidly adjusted, one part to another, and as suddenly relaxed; and the one seems to be about as difficult as the other. In this a certain sudden tension of the vocal apparatus is essential. The whole respiratory apparatus, after the breath is taken, is held more or less tense. In executing these abrupt (staccato) effects the diaphragm is the chief agent, and operates against the column of air in the lungs, the chest and abdominal walls being kept more or less tense.