Specific Velocities of Ions in the Discharge from Points. 8*: 

 of the high value of V-f. On emptying and filling the dis- 



charge-tube with oxygen, the readings changed to those of 

 B III., and showed no further tendency to fall. It is worth 

 noting the similarly high value of V + for air in the case of 

 B.F., as it was also obtained directly after discharging in 

 hydrogen. 



Turpentine. 



It was of interest to see whether non-conducting liquids 

 could be treated in the same way as gases, and several 

 experiments were made with that object, mostly on tur- 

 pentine. It was of course necessary to modify the apparatus 

 to measure the discharge pressures, and after some failures 

 the design shown in fig. 1 was adopted. 



Ficr 1. 



CEEDI 



T is a glass discharge-tube of about 10 square centimetres 

 cross-section, into the side of which are sealed the ends of 

 the loop A ABB; the lower portion of the loop being fastened 

 to a metal slab at BB. is pivoted at D, and supported 



G2 



