ATMOSPHERIC IONS. 



149 



Table 51. Continued. 



93. Remarks on the tables. Perhaps the most expeditious way of 

 digesting this large body of observations is to plot them graphically 

 (as above, figs. 58-61) in relation to time. This was carefully done 

 throughout, and the statements now to be made refer to this summary. 

 It is not probable that positive and negative ions will show the same 

 fluctuations in number, but a general similarity in the trend of the 

 curves may be anticipated. 



Beginning with August, 1905, the positive and negative ionizations 

 usually vary in the same sense, though rarely in the same absolute magni- 



