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
[LISTEN]. 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
[LISTEN]. My assertion, therefore, amounts to this, that everything below
[LISTEN] 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
[LISTEN] 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