About one o'clock
He knew that the guide must feel more or less anxiety , despite his brave outward showing . And when Jim thought no one was observing he would look out of the tail of his eye at every clump of bushes that seemed any way suspicious , as long as they were upon the river . And hence , it was doubtless a positive relief when they started out on the broader water of the lake ; for after that he would only have to watch one shore . About one o'clock they again started . The air continued cold , but bracing , and this made paddling a pleasure , up to a certain point . All of the scouts took a hand at it , even Bumpus , and received more or less valuable instruction from the two guides , as to how the paddle should be worked in order to have as little `` lost motion '' as possible ; and at the same time secure the greatest amount of benefit . But when after half an hour of labor , they found their muscles beginning to tire from the unaccustomed motion , the boys considered themselves lucky to be able to turn the paddles over once more to the canoe men , who were used to the job , and could keep it up steadily all day , if need be .