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 in length: it has 114 locks and sluices, and a tunnel 720 feet long. The breadth of the canal is 144 feet, and its depth six feet: it was begun in 1666, and finished in 1681, and cost £540,000 sterling, or £3,000 sterling a mile.

The Holstein canal, begun in 1777, and finished in 1785, extends about fifty miles: is 100 feet wide at the top, and 54 at the bottom, and not less than ten feet deep in any part. Ships drawing nine feet four inches of water, pass through it from the German ocean, in the vicinity of Tonningen, into the Baltic. From two to three thousand ships have passed in one year. The expense of the whole work was a little more than a million and a half of dollars, which would be at the rate of 30,000 dollars a mile for this ship navigation.

The extreme length of the canal from the Forth to the Clyde, in Scotland, is 35 miles. It rises and falls 160 feet by means of 39 locks. Vessels pass drawing eight feet water, having 19 feet beam, and 73 feet length. The cost is calculated at £200,000 sterling, which is at the rate of about 23,000 dollars a mile. But this was a