DEcLiylrY OF RlyERR.-A very slight ,lecIyits
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DEcLivITY OF RivERR.-A very slight decIvity will suffice 10 give the running notion to water Three inches per mile, in smooth, straight channel, gives velocity of about three miles an hour. The Ganges, says writer, which gathers the waters oi the timalaya mountains, the lollcst in the world IS, 1900 miles from its mouth, only egh hundred feel above the level uf the sea-,hat is about twice as high

 as St Paul's church, in London; and to fall these eight hundred feet in It's long course, the re- qulres more than a month. The great river Magda- lena in South America, running for thousand miles between two ridges of inc Andes, falls only five hun dred feet in that distance. Above the commence lnent of the thousand miles, it descending in apids and acataracis from the mountain.A The gi- ganiic Rio de la Plata has gentle descent to the ocean, that Paraguay, 800 miles from its mouth, ships are seen which have smiled against the current all the way, by the force Of the wind alone,ha is to say, which. telbeauliiu and inclined plane of the streams have been gradually lifted by the soft

 wind, and even against the current to an elevation greater than that of our lohlest spire. '- @H