The boy stepped slowly from log to log close to the head of the jam. The dark water swirled out from beneath the logs as though trying to tear them loose. Carefully he examined log after log, hoping that he might be able to locate the one which might be causing all the trouble. He had, before now, seen jams held up for days, while the drivers sought for the key log, when all that was needed to start the entire mass in motion was a slight movement of a certain log. It was this log, if such there were, that he was trying to locate. Of course he was aware that Jean and his men had examined them a number of times, and having failed to find it he knew that his chances of success, where they had failed, were slight. But this did not deter him from his determination to find it, provided it existed. Slowly he worked his way along until he had reached the center of the river. Here the logs were piled three or four deep in what seemed like a hopelessly tangled mass. For some minutes he stood on one end of a large spruce which reached out for five or six feet over the water. A significant appearance of the water two or three feet beneath him had caught his eye. “There’s a big rock down there, unless I’m very much mistaken,” he muttered to himself, as he stretched out at full length on the log in order to get his eyes nearer the water. Eagerly he strained his eyes to pierce the rushing water. Then, as the sun suddenly came from behind a cloud, he straightened up. “I thought so,” he whispered. “And the key log is jammed tight against it.” “Found your key log?” Bob called, as Jack started back toward them. “Mebby,” he replied, as he reached the log on which they were standing. “Do you really mean it, Jack?” Mr. Golden asked anxiously. “Well, of course I can’t be sure, but there’s a big rock out there in the middle. It’s about a foot and a half under water and there’s a big log jammed tight up against it.” “Let’s go look at it,” Bob proposed, as he started jumping from log to log, closely followed by Jack. Mr. Golden and Rex followed much more slowly, as they had to be more careful where they stepped. “I don’t see any rock,” Bob declared a moment later, as he stood on the log reaching out over the water. “Neither could I till I got my eyes close down to it,” Jack retorted. “You’re right, as usual,” he acknowledged a moment later, after he had followed Jack’s example. “And what’s more, I believe that’s the log that’s doing the trick.” By this time Mr. Golden and Rex had joined them, and after they too had stretched out on the log, they agreed with Bob. “Hello, Jean!” Mr. Golden shouted. Jean, who at the moment was working well over toward the opposite shore, raised his head at the shout. “Come here a minute,” Mr. Golden ordered, beckoning with his hand. Jean, peavey in hand, came running to them. “What do you think of it?” Bob asked a moment later, after Jack had pointed out the situation to him.