Read it through once

At the time that wages soared so high on the Missouri River, my chief, Mr. Bixby, went up there and learned more than a thousand miles of that stream with an ease and rapidity that were astonishing. When he had seen each division once in the daytime and once at night, his education was so nearly complete that he took out a 'daylight' license; a few trips later he took out a full license, and went to piloting day and night--and he ranked A 1, too.