I go 



Transactions of the Canadian Institute. 



[vol. IX 



Table XI. — Hydrogen in Apparatus. 



Carbon electrode at Temp.-I92° C. 



Charge on carbon =-84 volts. 



From these results the values of the secondary radiation from the 

 carbon at different temperatures in oxygen and in hydrogen were de- 

 duced as with the air, by taking the difference between the final rates 

 of charging of the polonium without and with the magnetic field applied. 

 These are given in Tables XII. and XIII. 



Table XII. — Fresh Carbon in Oxygen 

 Secondary Radiation from Carbon and Oxygen Layer. 



Table XIII. — Fresh Carbon in Hydrogen. 

 Secondary Radiation from Carbon and Hydrogen Layer. 



Temperature of Carbon. 



24° C 



-192° c 



Secondary Radiation 



147 



-236 



Here again we find that both with oxygen and with hydrogen the 

 results shew that the secondary radiation was much greater when the 



