My idea was (partly) to restore her circulation.

I next removed her boots, which were now rendered useless, as I argued, by the sea-water, and began to rub her feet.
I was just considering what to remove next, when the girl opened her eyes.

"Stop rubbing my feet," she said.
"Miss Croyden," I said, "you mistake me." I rose, with a sense of pique which I did not trouble to conceal, and walked to the other end of the raft.

I turned my back upon the girl and stood looking out upon the leaden waters of the Caribbean Sea.

The ocean was now calm.