at the Electrodes in Vacuum- Tube Discharge. 631 



use as anode did not seem to affect the results from either as 

 cathode.) The observations of the cathode drop at various 



Fig. 4. 











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gas-pressures are embodied in Table VII. (p. 032) ; they are 

 represented graphically in fig. 5 (p. 633). Owing to insuffi- 

 cient care in the preparation of the gas, the results, as may 

 be seen in the figure, for the different gas-pressures are not 

 consistent with each other, in that they do not for the same 

 electrode converge at all pressures to the same point. They 

 are of greater value, however, in that they show the inclination 

 of the line (representing the cathode drop as it varies with the 

 current) to be independent of the metal used as cathode in 

 impure as in pure gas. 



2 T 2 



