

52 e. a. McGregor 



By a comparison not only between the humidity and irriga- 

 tion data for Imperial Valley but, in addition, between the hu- 

 midity of Imperial Valley and San Diego, we believe we have 

 demonstrated beyond question that the relative use of water at 

 successive periods throughout the season is not a controlling fac- 

 tor of humidity at these respective periods. We will even go as 

 far as to state that our studies justify the opinion that no ap- 

 preciable influence upon the course of humidity through the 

 season is exerted by the amount of irrigation water distributed 

 over the Imperial Valley. 



If our deductions are correct, therefore, we have obviously re- 

 futed the generally accepted belief throughout the Imperial Val- 

 ley that the degree of atmospheric humidity is directly influenced 

 or controlled by the relative amount of water that is distributed 

 over the land by irrigation. And, as above stated, we are con- 

 vinced that the seasonal humidity fluctuations are to be ac- 

 counted for through geographically far-reaching meteorological 

 factors. 



