184 



BARUS— METHOD OF STAXDARDIZING 



[April 24, 



and negative, if io'V = 3.4. Only 65/170, or about 38 per cent., 

 of this is actually caught in the given fog chamber on exhaustion, 

 provided the old coronal values are corect. 



If, however, it is assumed that negative ions only are caught 



^^ViQ. ^ a 



during exhaustion in the fog chamber in question, then the value of 

 the electron would be 



io^'>e = 2,.4 X 2.62 X i =44 electrostatic units. 



The irregularities of the curves, Fig. 2, are due in part to fluctua- 

 tions of the drift and in part to errors inevitable in derivations so 



