You can no more explain many happenings which are the merest commonplaces in latitude 2 N., longitude (say) 46 W., than you can explain the miracle of faith, or the wonder of telepathy, as this story goes to show. In the dead of a night Mr. Commissioner Sanders woke. His little steamer was tied up by a wooding--a wooding he had prepared for himself years before by lopping down trees and leaving them to rot. He was one day's steam either up or down the river from the nearest village, but he was only six hours' march from the Amatombo folk, who live in the very heart of the forest, and employ arrows poisoned by tetanus. Sanders sat up in bed and listened. A night bird chirped monotonously; he heard the "clug-clug" of water under the steamer's bows and the soft rustling of leaves as a gentle breeze swayed the young boughs of the trees that overhung the boat. Very intently he listened, then reached down for his mosquito boots and his socks. He drew them on, found his flannel coat hanging behind the door of his tiny cabin, and opened the door softly. Then he waited, standing, his head bent. In the darkness he grinned unpleasantly, and, thumbing back the leather strap that secured the flap of the holster which hung by his bunk he slipped out the Colt-automatic, and noiselessly pulled back the steel envelope. He was a careful man, not easily flurried, and his every movement was methodical. He was cautious enough to push up the little safety-catch which prevents premature explosion, tidy enough to polish the black barrel on the soft sleeve of his coat, and he waited a long time before he stepped out into the hot darkness of the night. By and by he heard again the sound which had aroused him. It was the faint twitter of a weaver bird. Now weaver birds go to sleep at nights like sensible people, and they live near villages, liking the society of human beings. Certainly they do not advertise their presence so brazenly as did this bird, who twittered and twittered at intervals. Sanders watched patiently. Then suddenly, from close at hand, from the very deck on which he stood, came an answering call. Sanders had his little cabin on the bridge of the steamer; he walked farther away from it. In the corner of the bridge he crouched down, his thumb on the safety-catch. He felt, rather than saw, a man come from the forest; he knew that there was one on board the steamer who met him. Then creeping round the deck-house came two men. He could just discern the bulk of them as they moved forward till they found the door of the cabin and crept in. He heard a little noise, and grinned again, though he knew that their spear-heads were making sad havoc of his bedclothes. Then there was a little pause, and he saw one come out by himself and look around. He turned to speak softly to the man inside. Sanders rose noiselessly.