12 
BULLETIN 181, U. S. DEPAETMENT OF AGEICULTURE. 
The hydrograph shown in figure 4, A, is that for the Pearl River 
at Jackson, Miss., covering a period from May 18 to July 17, 1909; 
it indicates all fluctuations in rate of run-off during that period. The 
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initial rise occurring on May 18 was due to the rain of May 15, and 
the final rain affecting the run-off for the period considered occurred 
on July 9. The upper curve of the diagram represents the actual rate 
of run-off for the period; the lower curve indicates what the rate of 
