One time it was a piercing cry as of someone in agony; at another a sneering, chuckling laugh taken up in a chorus as if by a mocking party of strange watchers, who, accustomed to the darkness, could see everything going on aboard the brig; whisperings; sounds of crawling creatures passing over sticky mud and wallowing impatiently in their efforts to get along; peculiar angry barkings uttered by the alligators; and a dreadful rustling in the trees, which Brace felt certain must be caused by huge serpents winding in and out amongst the branches. He suggested this to the captains who uttered a grunt. "Very likely," he said. "They do creep about in that way after the monkeys. 'Tis their nature to. This is the sort of country for those gentlemen, both the dry ones and the wet ones." "I don't understand you," said Brace. "Oh, you mean the boas and the anacondas." "That's right, squire, and I daresay we shall see some tidy big ones. Yes, that sounds like one working about. Ah! he struck at it and missed, I should say. Bit disappointing, for snakes like their suppers as well as other people, and I'm going down to have mine. Are you coming?" "No," said Brace decisively; "I'm going to stay up here and listen." Sir Humphrey and Briscoe elected to do the same, and for another hour they listened, and watched the display made by the fireflies; while every now and then, as the muddy water trickled and seemed to whisper against the sides of the brig, the listeners were startled by some strange splash close by, which sounded to them as if the river swarmed with huge creatures which kept on swimming around and beneath the vessel, partly attracted by curiosity as to the new visitor to their habitat, partly resenting its presence by splashing and beating the surface as they rose or dived. "It's all very interesting," said Briscoe at last, "and I could stop here all night watching and listening; but we must have sleep, or we shall be no good to-morrow, so I'll say good night, gentlemen. If anything happens, my gun and rifle are both loaded, and I'll come on deck directly." "That's right," said Brace sharply. "But what can happen?" "Who can say?" replied the American. "We know we're in a wild country, perhaps the very first of all people who have come so far into the forest, and we don't know what enemies may come. I'm pretty sure of two: stinging insects and fever; but there's no telling what may come out of the dark jungles. We're pretty safe from wild beasts, but for aught we know we may have been watched by savages ever since the morning. Savages generally have canoes, bows, spears, and clubs. I don't say it's likely, but some of them might come creeping aboard in the night, and if I was captain I should arm the watch. Ugh! what's that?" he cried, in a horrified tone. "Barrel of my rifle, Mr Briscoe," said Lynton quietly, from out of the darkness. "Why did you do that?" said the American sharply.