Cathode and Anode in a Geissler Tithe. 455 



Table X. — Carbon dioxide. 

 Pressure = 1*9 mm. 

 Table IX. — Carbon dioxide. 

 Pressure =7*0 mm. 



i. 



T (°C). 



000063 



630 



0-00147 



13-40 



000167 



16-75 



00175 



17-65 



0-00180 



1755 



0-00197 



19-35 



0-00216 



18-55 



0-00235 



21-15 



0-00240 



23-15 



i. 



T (°C). 



000135 

 0-00205 

 0-00247 

 0-00272 



10-1 

 160 



18-8 

 20-8 



Table XI. — Carbon dioxide: 

 Pressure = 0*30 mm. 



i. 



T (°C). 



0-00057 

 000100 

 000160 

 0-00260 



4-2 



8-7 



125 



20-7 



These results are shown in Curves I., II. , and III. The 

 curves show that for the range of temperature obtained, a 



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linear relationship exists between the current and the tempera- 

 ture of the cathode for all the gases. This is to be expected 

 if the rate of cooling of the cathode is proportional to its 

 excess temperature above that of the air. The cooling curves- 

 obtained showed that this was nearly so. 



