Then, again, there were areas where man had left entirely different marks resulting from his activities. The second growth timber had covered the bare places, but there were no snags present. These were places where the land had been cut over for lumber. In some cases the sawmills were still operating and Bill could see the smoke coming from the stacks of the boilers. He could make out the tracks of the narrow gauge which hauled the large logs to the mill and the donkey engines working some distance from the mill, furnishing the power by which the logs were snaked to the narrow gauge tracks or to the slides.