WIND, TEMPERATURE AND EVAPORATION 215 



The standard deviation of the temperature is 15.26° ± 0.32°, 

 and the coefficient of correlation is 0.687 ± 0.0156, which is a 

 much closer correlation than in the case of air movement. 



h musl be understood, of course, that these coefficients apply 

 only to open pan evaporation at this particular station, as it 

 occurs under the standardized conditions fixed by the Depart- 

 ment of Agriculture, and that the relation they have to evapora- 

 tion from the soil or trees or other types of plants is still unknown. 



Similar statistical studies of the data collected at the other 

 evaporation stations, where topography, climate, and other fac- 

 tors might modify the coefficients to a certain extent, would be 

 interesting. Such data would furnish a basis for comparison of 

 climatic complexes, and would no doubt be of interest and value 

 to ecologists generally. 



