RAIN AND ITS ORIGIN IN THUNDERSTORMS. 

 TABLE I. 



387 



to become much greater than the frequency with which negative currents occur. In 

 other words, the greater the current the more likely is it to he carried by positively 

 charged rain. 



To these deductions the data for currents greater than 300 X 10~ 15 ampere appear 

 to be exceptions. But as 15 of the 18 negative currents greater than 

 300 X 10~ 15 ampere were recorded in a single and very abnormal storm on 

 May 13, the relation shown must be considered accidental. The values of the 

 greatest currents are of particular interest and the following list is therefore given of 

 all those having a greater value than 300 X 10~ 15 ampere. 



TABLE II. 



* These values are estimated from the time it took the boom to reach the stop at the edge of the paper 

 and are therefore only approximate. 



3 D 2 



