White-ringed eddies span along the bank and the tops of dark rocks rose out of the turmoil.

Moreover, there were rocks in the channels, and one must strain one's eyes for the upheavals that marked sunken shoals.

Driscoll knew the reefs and eddies, and while they plunged down like a toboggan Thirlwell risked a glance astern.

The man's eyes were fixed on the river, but his pose was slack.

It was plain that he had not recovered and they could expect no help from him.