Provide a species of whistle common as a child’s toy, or a sportsman’s
call, in the form of a hollow cylinder, about three fourths of an inch
in diameter, closed at both ends by flat circular plates with holes
in their centres. Hold this toy between the teeth and the lips; blow
through it, and you can produce sounds, varying in pitch with the force
with which you blow. If the air be cautiously graduated, all the sounds
within the compass of a double octave may be produced from it, and if
great precaution be taken in the management of the breath even deeper
tones may be brought out. This simple instrument or toy, has indeed the
greatest resemblance to the larynx, which is the organ of the voice.