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Croll shows, that the mean level of its enormous area of drainage must be lowered 1/4566 of a foot annually, or 1 foot in 4566 years.
In 1840, a count kept at Cairo, showed 4566 vessels had passed that point during the year. By 1848, a "banner" year, in the history of navigation on the Mississippi, traffic was recorded thus: 25 vessels plying between Louisville, New Orleans and Cincinnati 8,484 tons 7 between Nashville and New Orleans 2,585 tons 4 between Florence and New Orleans 1,617 tons 4 in St.
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