482 



Prof. C. Barns on the Ionization 



Each series conforms pretty closely to a straight line, but 

 these lines differ in inclination for the different series. The 

 colours corresponding to the observations are added in a sug- 

 gestive way. Their real positions are not the same in all 

 series, electrically, but they are more nearly so, volumetrically. 



In other words, it is noteworthy that the colours referred to 

 volumes of charged air per minute (abscissas, Y) are roughly 

 in agreement ; whereas the electrometer data referred to the 

 same colour differ. Some variation of the constant of the 

 electrometer, if in question, would have shown itself in the 



