Read it through once

A big cat-fish collided with Marquette's canoe, and startled him; and reasonably enough, for he had been warned by the Indians that he was on a foolhardy journey, and even a fatal one, for the river contained a demon 'whose roar could be heard at a great distance, and who would engulf them in the abyss where he dwelt.' I have seen a Mississippi cat-fish that was more than six feet long, and weighed two hundred and fifty pounds; and if Marquette's fish was the fellow to that one, he had a fair right to think the river's roaring demon was come.