"We've got to get back or we'll miss that train for Chicago, and that won't do, for our berths have been engaged ahead." At the bridge leading to the Three Sisters Islands the whole party alighted, so as to get a better view of the upper rapids of the river.
As they did so, a youth seated on a rock near by looked at them in amazement.

Then of a sudden he slipped off the rock and dodged out of sight.
The youth was Nat Poole..