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The drainage of marshes and marshy lands has considerably extended.
The drainage of Manitoba is entirely northeastward to Hudson Bay.
Below the confluence the Kabul becomes a rapid stream with a great volume of water and gradually absorbs the whole drainage of the Hindu Kush.
These basins of internal drainage are calculated to amount to 22% of the land surface.
The suggested causes are (I) reduction of insects by drainage, (2) reduced population, (3) the use of quinine.