THE WEATHER CYCLE 



6l 



the amount of rain raised from the sea by 

 evaporation. We cannot expect that rainfall 

 will anywhere vary with mathematical regu- 

 larity. Rainfall is one of the most complex of 



FIG. 13. Rainfall map of New South Wales for 1894, shaded area 

 showing where the rainfall was above the average. (After Russell). 



meteorological products, and is the resultant 

 of a series of conflicting agencies. The 

 supply of moisture available depends on the 

 evaporation at sea, on the strength and direc- 

 tion of the winds that carry it inland ; the 

 amount of rain that falls at any locality depends 

 on the temperature of the soil in the district, 



