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Clay and sand will absorb water at a different rate, and, baving 
absorbed it, hold and retain it more or less loosely. 
These properties have been measured at the sub-stations of the 
College of Agriculture of the University of California, and the 
following diagrams show the extent to which water from fairly 
deep furrows penetrates the sandy soil and the heavy loam at the 
sub-station. 
Bnck Scraper ready for work. 
The spread and the descent of water are carefully mapped out 
on these charts. 
The furrows are seven inches deep, aud the water was run two 
days of twelve hours each. Seventy-two hours after irrigation the 
extent of soil-saturation was measured, the sectional area showing 
