Next day—or it may have been two days later, for none of them could be quite sure about the passage of time—they came to a deserted lumber-camp. Even more than two days might have passed; because now their bacon was all gone, and only coffee, tobacco, beef-cubes and pilot-bread remained. The lack of fish and game had cut alarmingly into the duffle-bag. That day—whatever day it may have been—all four of them suffered terribly from headache of an odd, ring-shaped kind, as if something circular were being pressed down about their heads. The Professor said it was the sun that made his head ache. Vivian laid it to the wind and the gleam of the swift water, while Marr claimed it was the heat. Jandron wondered at all this, inasmuch as he plainly saw that the river had almost stopped flowing, and the day had become still and overcast.