Powell walked up it three or four miles, having no trouble in crossing it by wading when desirable.

He called the new gorge now before him, really only a continuation of the one ending with the canyon of the Little Colorado, the "Great Unknown," and a party some twenty years later, emulating the early Spaniards in the art of forgetting, called it the same, but it was the Great Unknown only once, and that was when Powell on this occasion first faced the sublime, unfathomed depths that here lay in his course.

Only one month's rations remained as a reliance in this terrible passage.

Powell says: "We have an unknown distance yet to run; an unknown river yet to explore.

What falls there are we know not; what rocks beset the channel, we know not; what walk rise over the river, we know not....