He reported his find to White-Man's-Trouble on his return to the old Portuguese house that evening, and that worthy was seized with his usual tremors. "O Carter," said he, "dem bushmen that live by fish-palaver fit for be worst kind of bushmen. They come here one day soon, an' they throw spear till we lib for die, an' they chop us afterwards. You savvy?" said the Krooboy, with a whimper and a shudder--"chop us after?" "Don't try and work up my feelings over the post-mortem, because you can't do it. Once dead, what happens to my vile corpse doesn't interest me. But I don't intend to peg out yet, especially at the hands of a pack of ignorant cannibals like these. Observe, Trouble. You have seen me practise ju-ju already?" "I fit." "And you have been my assistant in the black art?" The Krooboy shuddered, but he said sturdily enough, "I fit." "Well and good. Then to-morrow we will weave infernal charms over this pleasing spot, till no mere black man, be he cannibal or be he simple fisherman, will dare to press his sacrilegious toes upon it." A stream of water poured over one part of the cliffs, that Carter designed hereafter for a power-plant to handle his ores. But in the meanwhile he turned it to a more immediate use. He cut wide bamboos, and fitting them into one another, formed a great pipe which would receive water and air together. With stones, and clay, and grasses he built a box to receive the air and water, and made a cunningly devised trap through which the water could escape, but not the air. Then with more bamboos he built him organ pipes and set the mouths of these in the box, so that the air should drive through them and blow a dismal note. And next, with further ingenuity he fashioned a commutating valve, also worked automatically by the water, which for a time would shut off the water, and then set it going again to thrill the air with the notes boo-paa-bumm, in ascending scale, and a minute later to reply bumm-paa-boo. It was all extremely simple when one knew how it was done, and extremely startling to walk in upon from the depths of a primeval African forest, and the fishers of the village, when the sounds first broke in upon their nervous ears, threw themselves down upon the dust, and waited for the end of the world, which they felt sure was at hand.