250 » Mr. G. Owen on the Discharge of 
temperature, a new series of observations was made in which 
the negative and positive leaks were measured, the latter 
Diagram 8. 
§ 00 
Joo 
600 
5oo 
Current. 
100 
Temperatures Centigrade. 
directly after the former, at various temperatures. The results 
are given in Table LX. in the exact order in which they were 
taken. 
Curves B and C in diagram 8 have been obtained from the 
numbers given in Table LX. From these curves it will be 
seen that below 1400° C. the positive leak 1s larger than the 
negative leak. Above this temperature the negative leak is 
the bigger, and the ratio of the negative leak to the positive 
increases rapidly with the temperature. At the highest 
