To those who have had no experience of the jungle, who happen never to have passed a night in such tropical forests as those which clothe the ground about the Isthmus of Panama, the deadly silence that pervades everything is perhaps the most noticeable feature of all. It is almost terrifying in its intensity, and with dense darkness to help it is apt to awe even the boldest. And when, as happens so often, that silence is suddenly and most unexpectedly broken by the call of some prowling wild beast, when a sharp hissing sound and a rustling amongst the fallen leaves near at hand tells of a creeping snake, then indeed the nerves tingle, the novice feels a strange sensation about the roots of his hair, while perspiration gathers thickly on his forehead. Yes, the bravest are awed. Even the old hand, the experienced hunter, holds his breath and halts to listen, his senses all alert, ready to defend his life against danger. So it was with Jim and his friends. One only was accustomed to the jungle; and for a while, after diving into its darkness, they were overawed by its deathly silence at one moment, and at another moment by the weird calls which came to their ears. The lamplight shining on Tom's face demonstrated the fact that he was trying to smile; but it was an uneasy and an unnatural movement. "By de poker," he gasped, "but not like dis at all! De leaves whisper murder. De branches ob de trees call out and say: 'Take care'. Tom all ob a shiber." "He, he, he! Yo not like him, dis forest," grinned Ching, though, to tell the truth, the Chinaman's slanting eyes were moving restlessly from side to side, in a manner which denoted fear. "Yo hold de hand ob dis Chinaboy; den feel braver. No harm come when Ching near. Yo come along wid me, Tom." His bantering tones caused the huge negro to change his smile for a scowl. He stretched out a hand and slowly doubled up the fingers, as much as to say that he could with pleasure take the Chinaman in one hand and crush the life out of him. He began to exclaim, but Jim cut him short. Our hero brushed the sweat from his forehead, and swung round upon the two. "Silence, you babies!" he exclaimed. "A sound travels far in the jungle, and who can say how near we are to those villains we are searching for? Silence! Follow in single file, and take care that you do not tread on fallen branches and twigs. I have often heard it stated that the snap of a broken twig can be heard as plainly as the report of a pistol. Guess it's true, too." "But dere no fear jest now, Massa Jim," interrupted Sam, his little eyes twinkling in the light of the lamp which dangled from his finger. "Still, all de same, dat lubber ob a Tom better take care and keep him mouth shut. Him never can speak soft; him shout and bawl. Him a great, big, hulkin' bull, I reckon."