Materials Required:—

A piece of hollow bamboo about eight inches long, a cork, a penknife.

This is another whistle made of a short length of bamboo cane, which is hollow, cut just below one of the "knots" or divisions where the hollow tube is blocked by a solid wall of the wood. If you cannot get this, block one open end of your hollow tube of wood with a cork, and for the other cut a piece of cork or wood to fit, with a slice off to leave an opening into the tube. Now cut semicircular holes in your tube at intervals. These will each produce a different note if the others are stopped with the fingers, and with care a regular sequence of the notes of a scale can be planned. This sequence will depend on the size of the tube—its length, and the distance between the holes.