Of course, this mineral matter is derived in considerable measure from springs, but is also no doubt to a large extent taken up by the rivers themselves, as they wash the rocks and Soils on their journey to the sea.
"Geology"
James Geikie
The same difficulties would attend the distribution of the fertile and the poor Soils.
"Contemporary Socialism"
John Rae
The growth of population increases the demand for food so much as to raise its price, and renders it profitable to resort to more difficult Soils or more expensive methods for additional supplies.
"Contemporary Socialism"
John Rae