Induced-Radioactivity in Air, 359 



Curves representing the results of these experiments are 

 shown in fig. 1. 



Kff. 1. 



600 700 800 900 



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In these experiments the central electrode was not sup- 

 ported by the ebonite plate at the centre of the lid of the 

 vessel containing the modified gas, but was supported above 

 the vessel and passed into the vessel through a hole in the lid 

 winch it did not touch. 



The air when in the modified state produced by bubbling 

 through water can be transferred from one vessel to another 

 and still retain some, at least, of its conductivity. To show 

 this a second vessel was prepared. This was a large galvanized 

 iron cistern supported on insulating feet, a central wire placed 

 along its axis was kept connected with the electrometer, and 

 the current between this wire and the case of the cistern 

 measured. This vessel, which we shall call B, was connected 

 by a metal pipe about 150 cm. long and 1 cm. in diameter 

 with the vessel A, in which the modified gas was stored. 

 Wheu air was blown from A to B the saturation-current 

 through A diminished, while that through B increased. 



- The gas, while passing through the tube between A and B, 

 could easily be subjected to various physical processes, and 



