Cathode Rays and certain Chemical Effects. 229 



are straight lines passing when produced through the origin 

 o£ coordinates — showing a very fair proportionality between 

 N and p over the range o£ values examined. 



N Fig. 4. 



p (mm.) 



To plot the variation of N with ray velocity the values of 



N as they appear in Table III. have been reduced to a 



common pressure and entered in column 4 of the same table. 



1ST 

 In Table IV. these values of — are collected and entered 



P 



against the values of the corresponding ray velocities, the 



means for the various ray velocities being taken. 



Table IV. 



1. 



Ray velocities 



in terms of 



solenoid current. 



2. 



Ray velocities, 

 cm. Xl0~ 9 . 



3. 



N 

 V 



4. 



4"3amps 



4-7 



51 

 5-5 

 60 

 6o 

 7-0 



2-92 

 3-20 

 3-47 

 3-74 

 4-08 

 442 

 4-76 



22-1 

 18-5 

 15-8 

 13-6 

 11-5 

 102 

 9-2 



34 



2-8 

 2-4 

 2-1 

 1-8 

 1-6 

 1-4 



