Bridging a trail-gap means stopping to think when you lose a trail.

You have to decide where it most likely starts again.

That's what grown-up scouts call mental tracking.
So I sat down on Ridgeway's carriage step and thinked a couple of thinks.

That's right on Main Street, you know, and I had to decide if that person went up or down Main Street or across the street.
Right across the street is the big bank building.

I've got forty-two dollars and eighteen cents interest in that bank.