Smell and sight told them nothing.

Near as they were to the goal, they went up again.
No matter, the endeavour has its uses.

Threads were laid on the way and will serve as a lure to further enterprise.

The road of deliverance has its first landmarks.

And, two days later, on the eighth day of the experiment, the caterpillars--now singly, anon in small groups, then again in strings of some length--come down from the ledge by following the staked-out path.