The female voice is treated in the same unnatural way. Many teachers teach their pupils to sing with the lower series of the chest register as high up as possible, often to the e¹ f¹, as far as the organs permit, and then let them begin the falsetto register. In this way the second series of the chest register is entirely omitted; but the made tones, as the expression is, thus obtained, sound very disagreeable and coarse, and the falsetto tones, which in this way begin lower than necessary, are on the contrary faint and weak. Of the falsetto register these teachers commonly require only the first series, up to d² e♭², to be sung, and then directly begin the head tones. Thus the second series of the falsetto is not used; but the tones belonging to it, which are sung with the first series of the falsetto register, are for the most part hard and sharp and seldom pure, while the tones of the head voice, coming in too soon, are thin and unmusical, and the whole voice thus receives an irregular formation. Many teachers, again, allow the lower tones of the chest register to be sung with the higher series of the same, whereby these tones are naturally never as sweet and strong. Then, too, they press the first series of the falsetto up to d² e♭², and thence, as far as it is possible, the voice is to ascend with the second series of the falsetto, without admitting the head tones, even in voices with the high soprano timbre. But the tones thus forced up are for the most part sharp and destitute of all grace. And it is just this that is one of the commonest faults of our present mode of singing. As it has been customary to cultivate, in the male voice only, the three lower series, because both of the highest sound sweet and graceful only from the soft, delicate organs of the female voice, and as the male voice is rarely capable of compassing the highest series, the erroneous idea has gradually obtained prevalence among teachers of singing, that there are only three different series of tones, and that the female voice has only two transitions. In voices fresh and unvitiated the different series are very easily distinguished by their different timbre. One hears this difference of timbre most clearly in the transition of the second series of the chest register into the falsetto in the male voice, and in the female voice at the transition of the first series of the falsetto register into the second. As has been observed, the larynx stands lower with the tones of the chest register than with the tones of the other registers, or during quiet breathing. In order, in the low chest tones, to bring the whole glottis into full vibration, the air, as it is expired, must press upon it with a larger volume. From all parts of the lungs the air, when expired, presses into the windpipe, the rings of which, widening as much as possible, come somewhat nearer to each other and draw down the larynx.