766 Prof. R. A. Millikan and Mr. H. Fletcher 



the 







Table III. 



(continued) 











No. of 



No. of 







No. of 



No. of 



9- 



F. 



charges 



charges on 



9- 



F. 



charges 



charges on 



7-0 





on drop. 



ion caught. 







on drop. 



ion caught. 



7-0* 



bal. 

 9-7 







1 P 



2 P 



3 P 



1 P 

 1 P 

 1 P 

 1 P 



6-9* 

 17* 

 bal. 



5-8 







1 P 



2 P 

 4 P 



1 P 



1 P 



2 P good 





5-3 



4 P 





















6-9* 







1 P 





7-0* 







1 P 

 1 P 

 1 P 

 1 P 





16* 



1 P 





18* 



1 P 













bal. 

 9-0 

 55 



2 P 



3 P 



4 P 



7*5 



69* 



16* 

 bal. 







1 P 



2 P 



1 P 

 1 P 





bal. 



2 P 



i r 





17-0* 



1 P 



1 P 

 1 P 

 1 P 



1 P 

 1 P 





io-o 



3 P 





bal. =40 



2 P 













9-0 



3 P 





bal. 



17* 

 bal. 



2 P 



1 P 



2 P 



1 N 

 1 P 

 1 P 





5-5 



18* 



4 P 

 1 P 





100 



3 P 





bal. 



2 P 













90 



3 P 





bal. 



2 P 



1 P 













io-o 



3 P 





bal. 



2 P 



1 P 

 1 P 





18* 



1 P 



1 P 



7-3 



9-0 

 5-5 



3 P 



4 P 





bal. 



2 P 













18* 



1 P 



1 P 

 1 P 

 1 P 

 1 P 





bal. 

 90 



2 P 



3 P 



1 P 





bal. 



2 P 













100 



3 P 





bal. 



2 P 



1 P 





5-8 



4 P 





8-8 



3 P 





34 



5 P 













bal. 



2 P 



1 P 













100 



3 P 











The above tables do not represent one half of the observations 

 which we have made upon ionization produced by either pri- 

 mary or secondary X rays of varying hardness, and Table III. 

 contains the best evidence which we have been able to obtain 

 at all in support of the hypothesis that doubles are even in 

 rare instances formed. Despite the fact that we began this 

 investigation with the firm belief in the correctness of this 

 hypothesis, we are forced to the conclusion that we have now 

 no reason whatever for assuming that the act of ionization of 

 air by X rays ever consists in the detachment of more than one 

 elementary charge from a neutral molecule. 



