produced from a Gas by High-Speed Cathode Rays. 213 

 Table I. — Air. 



Velocity of 

 'rimary Rays, 

 volts. 



0=0 



| 14.500 

 1 volts. 



100-0 



12,600 

 volts. 



100-0 



11,200 



volts. 



100-0 



10,500 



volts. 



1000 



8100 



volts. 



100-0 



7100 



volts. 



100-0 



03 



940 



94-6 



95-6 



96-6 



97-5 



95-5 



05 



900 



91-9 



91-0 



94-0 



91-0 



93-0 



0-7 



78-8 



84-1 



85-7 



87-8 



84-6 



83-5 



10 



76*5 



76-6 



75-6 



77-4 



77-0 



75-6 



1-6 



63-7 



65-1 



66-8 



65-0 



64-4 



64-6 



20 



60-0 



61-0 



615 



59-2 



61-6 



59-0 



2-5 



52-6 



55-8 



54-8 



54-3 



530 



54-5 



3 



49-9 



524 



50-6 



50-6 



50-2 



51-6 



4 



45-2 



45-3 



44-7 



43-3 



44-5 



46-8 



5 



41-0 



41-5 



41-7 



41-4 



39-5 



41-0 



6 



364 



39-2 



37-8 



37-0 



37-3 



36-1 



7 



34-7 



360 



36-1 



34-3 



351 



33-5 



S 



32-0 



33-1 



32-5 



31-9 



32-1 



29-4 



10 



290 



293 



28-2 



28-8 



27-0 



25-8 



14 



25 



24-6 



24-7 



250 



23-1 



22-9 



20 



206 



19-6 



18-9 



19-8 



18-4 



17-3 



30 



17-5 



17-6 



16-6 



16-8 



15-9 



15-1 



40 



16-0 



15-5 



15-1 



145 



12-7 



13-3 



70 



13-6 



12 8 



12-0 



11-6 



10-75 



1025 



110 



11-8 



11-3 



10-78 



10-10 



9-68 



846 



150 



1107 



10-34 



10-42 



9-04 



8-90 



7-41 



190 



10-72 



10-34 



9-82 



8-60 



8-24 



6-68 



270 



10-62 



9-87 



9-15 



8-02 



7-51 



6-24 



390 



1011 



9-12 



8-75 



7-72 



6-96 



6-01 



590 



955 



8-94 



8-36 



7-21 



669 



5-51 



790 



9-13 



8-24 



7-79 



6-83 



6-23 



5-18 



990 



8-80 



8-04 



7-55 



6-66 



6-04 



5-08 



1190 



8 85 



8-00 



7-53 



6-71 



6-02 



5-04 



1390 



8-68 



8-00 



7-41 



664 



5-84 



4-84 



1590 



8-50 



8-00 



7-29 



6-71 



5-93 



4-84 



1990 



8-68 



8-00 



7-41 



6-47 



5-93 



5-04 



The results obtained for hydrogen gas are given in Table II. 



§ 9. Examination of the Residual Currents. 



The nature of the residual currents obtained for the values 

 of v greater than 1000 volts was repeatedly examined. If 

 the residual currents are due to the secondary cathode rays 

 with very large velocities, the currents should decrease as 

 v increases, because it seems quite improbable that a gap 

 occurs between 1000 and 2000 volts in the distribution of 

 the velocities. But there was no evidence of such decrease. 



