IN RAIN AND SNOW, IN THE UNITED STATES. 



225 



The tabular mean results are graphically exhibited in Diagrams 5, 6, and 7 for 

 the more reliable groups. 



The irregularities in the successive annual amounts of raiu are very great, yet 

 they do not wholly obliterate the indications of a conformity to general laws ; thus 

 Diagrams 5 and 6 distinctly indicate an increase of rain, on the average, since 

 1835, and show a certain tendency to an arrangement of groups of years of drought 



Diagram 5. 



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 till 

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 pill 

 11 n 



iiriiniiiMi wii III III 1 

 II" II 1 1 iiiii' Mr 



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 11 



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FLUCTUATIONS EST THE AKNUAL RAIN FALL 

 Group I. — Atlantic Sea-coast, Maine to Maryland.. 



followed by unusually wet years. The fluctuations of rain, as shown on Diagrams 

 5 and 6, are evidently similar, and these groups might have been combined into 

 one; the fluctuations in the Ohio Valley are of quite a diflferent character. 



