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CHAPTER I. The Mississippi is Well worth Reading about.--It is Remarkable.--Instead of Widening towards its Mouth, it grows Narrower.--It Empties four hundred and six million Tons of Mud.--It was First Seen in 1542.--It is Older than some Pages in European History.--De Soto has the Pull.--Older than the Atlantic Coast.--Some Half-breeds chip in.--La Salle Thinks he will Take a Hand.