human
Before long we entered upon the worst part of this canyon. Rapids Fourteen, Fifteen, and Sixteen are so close together that they must be run without stopping, as there is practically no quiet water between them; and so rocky is No. Sixteen that it seems impossible to get through at all. Loper proposed to run it with his boat, the _Arizona_, while we watched the result. He handled the craft very dexterously, being an excellent oarsman, and was successful in striking the only place in Rapid Sixteen that a boat could pass through. But even here the current dashed hard against a huge rock, taking a vertical drop of four or five feet off one side. Loper found it impossible to keep the boat away from this boulder and she was swept heavily against it. She turned almost on end, but luckily the water was deep and she came up like a fish. After seeing Loper's experience Monett and myself were fearful of our ability to get through, and Loper bravely volunteered to bring our boats through, which feat he accomplished in safety.
gpt
SHE TURNED ALMOST ON END.