Determined, however, to run no unnecessary risk, Jack remained among the trees and rocks on the upper side of the break, where he could not be seen unless some one almost stepped upon him.

Not satisfied with his first position, he shifted further to the right, and lay down to wait and watch.
A gradual obscuring of the sky caused him to look at his watch.

Could it be possible?
The autumn afternoon was almost gone.

Night was at hand, whereas he had supposed several hours of daylight remained.

Thus valuable time had slipped past and nothing had been done for Fred Greenwood.
From where Jack lay he had a perfect view of the upper gate, as it may be called, of the canyon.