"It is very strange," he muttered. "Some one must have built this fire; but why he did so if he didn't want to camp beside it beats me. Hello! What's this? Hooray; we are on the right track after all! But what foolishness is that boy up to? and what can he be doing on this island? Thirdly, where is the raft? Eh, Bim! You haven't seen a stray raft round here, have you? No. I thought you would have mentioned it if you had. So he is on this island is he? and leaves word that we can find him by following the trail? Perhaps the trail leads to the raft; but where is the trail? Hello! you've struck it, have you? Good dog! Here, let me tie this bit of twine to your collar. There, now you're better than a lantern." As we all know, the trail upon which Billy Brackett and Bim were thus started led directly to the log-hut in the forest. When the former discovered this, he fully expected to find his nephew within. To his surprise, although a fire smouldered on the hearth, there was no other sign of human occupancy. Then the young man searched in vain for some bit of writing, such as had guided him to this point. "I declare!" he exclaimed at length; "the corollary is worse than the theorem, and things are becoming so decidedly mixed that we must begin to go slow. I for one propose to replenish that fire, and then bunk down right here for the rest of the night." With this the young man went out into the darkness and began groping about for wood with which to keep up the fire until morning. In the mean time, Bim, left to his own devices, had struck the trail leading from the hut to Winn's camp, and started along it, probably thinking that his master was following him as before. The dog soon discovered Winn, and undertook to establish friendly relations with him by rubbing his cold nose against the boy's cheek. The suddenness with which Winn started up caused the dog to spring back into the darkness, from the shelter of which he regarded his new acquaintance distrustfully. Just then Billy Brackett, to cheer the loneliness of his log-hut, began to chant the ballad of "The Baldheaded Man," and Bim, hearing his master's voice, darted off in that direction. Now Billy Brackett, though very fond of music, and possessed of an inextinguishable longing to produce melodious sounds, could not sing any more than Bim could. His efforts in this line had so often been greeted with derisive shouts and unkind remarks by his engineering comrades that he no longer attempted to sing in public. When alone, however, and out of hearing of his fellows, he still sometimes broke forth into song. Bim always howled in sympathy, but the effect of their combined efforts had never been so surprising as upon the present occasion, when they caused the precipitate flight from the island of the very nephew for whom the young engineer was searching.