11. [The vocal cords in singing, after French]

12. [Vertical section through the head and neck to show the larynx and resonator]

13. [Diagram (after Aikin) of the resonator in the production of the vowel sounds]

14. [König's flame manometer]

15. [Diagram of a neurone]

16. [Left hemisphere, showing cerebral localisation]

17. [Diagram to illustrate cerebral mechanism of speech, after Bastian]

18. [The course of innervation currents in phonation]

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