xviii CHILDHOOD AND YOUTH 167
wax. The holes are stopped by the fingers, each pipe emitting its note only when its hole is stopped. The physical principles involved are obscure to us. Varieties of this instrument are made by all the tribes of Borneo as well as by many other peoples of the far East (PL 70).
The bamboo harp is similar to that made and used by the Punans (see Fig. 86) ; the sapeh is a two-stringed instrument of the banjo order ; the strings are thin strips of rattan ; the whole stem and body are carved out of a single block of hard wood (see PL 170 and Fig. 20).
Some of the girls learn to execute a solo dance, which consists largely in slow graceful movements of the arms and hands (PL 170). The bigger boys are taught to take part in the dance in which the return from the warpath is dramatically represented. This is a musical march rather than a dance. A party of young men in full war-dress form up in single line ; the leader, and perhaps two or three others, play the battle march on the keluri. The line advances slowly up the gallery, each man turning half about at every third step, the even numbers turning to the one hand, the odd to the other hand, alternately, and all stamping together as they complete the turn at each third step. The turning to right and left symbolises the alert guarding of the heads which are supposed to be carried by the victorious warriors.