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."