If they have a dislike to a native they can kill him by stealing on him at night and consuming his flesh.

They enter him like pieces of quartz, and the pain they occasion is always felt.

Another boyl-ya has however the power of drawing them out and curing the affected person by certain processes of disenchantment.

When this operation is effected the boyl-yas are drawn out in the form of pieces of quartz, which are kept and considered as great curiosities by the natives.

All natural illnesses are attributed to these boyl-yas, or to the Wau-guls, hence the reason of some native being killed when another dies.