Aztec whistles
The Mexicans possessed a small whistle formed of baked clay, a considerable number of which have been found. Some specimens are singularly grotesque in shape, representing caricatures of the human face and figure, birds, beasts, and flowers. Some were provided at the top with a finger-hole which, when closed, altered the pitch of the sound, so that two different tones were producible on the instrument. Others had a little ball of baked clay lying loose inside the air-chamber. When the instrument was blown the current of air set the ball in a vibrating motion, thereby causing a shrill and whirring sound.
Antique pipe from central America
Rather more complete than the above specimens are some of the whistles and small pipes which have been found in graves of the Indians of Chiriqui in central America. The pipe or whistle which is represented in the accompanying engraving appears, to judge from the somewhat obscure description transmitted to us, to possess about half a dozen tones. It is of pottery, painted in red and black on a cream-coloured ground, and in length about five inches.
Pipes of the Aztecs
Among the instruments of this kind from central America the most complete have four finger-holes. By means of three holes, four sounds (including the sound which is produced when none of the holes are closed) can be emitted: the fourth finger-hole, when closed, has the effect of lowering the pitch a semitone. By a particular process two or three lower notes are obtainable.