"Instruments:—
"15. What are their instruments of percussion (such as drums, castanets, rattles, cymbals, gongs, bells, etc.)?
"16. Have they instruments of percussion containing sonorous plates of wood, glass, stone, metal, etc., upon which tunes can be played? and if so, write down in notation, or in letters, the tones emitted by the slabs.
"17. Have they drums with cords, or some other contrivance by means of which the parchment can be tightened or slackened at pleasure?
"18. Have they drums with definite tones (like our kettle-drums)? and, if so, what are the tones in which they are tuned when two or more are played together?
"19. Any open hand-drums with one parchment only (like our tambourine)?
"20. Are the drums beaten with sticks or with the hands?
"21. What wind-instruments (trumpets, flutes, etc.) have they?
"22. Any trumpets with sliding tubes (like the trombone)?
"23. How are the flutes sounded? is there a plug in the mouth-hole?