A memoir by Mark Twain of his days as a steamboat pilot on the Mississippi River before the American Civil War, and also a travel book, recounting his trip along the Mississippi River from St. Louis to New Orleans many years after the War. The book begins with a brief history of the river as reported by Europeans and Americans, beginning with the Spanish explorer Hernando de Soto in 1542. It continues with anecdotes of Twain's training as a steamboat pilot, as the 'cub' (apprentice) of an experienced pilot, Horace E. Bixby.