86 



ROYAL SOCIETY OF CANADA 



Observations were made at atmospheric pressure on the active de- 

 posits obtained on both electrodes for distances 1, 2, 3, 4, 5, 6 and 8 

 mms., and the results are all recorded in Table I. A curve illustrating 

 them is shown in Fig. II. From these results it will be seen that as the 

 electrodes were separated the activity obtained on both plates steadily 

 decreased. With distances apart greater than 3 mms. no measurable 

 activity was obtained on the anode, but with the greater distances, viz., 

 8 mms., the active deposit obtained on the cathode was still about one 

 half that obtained on the same terminal for a separation of only 1 mm. 



TABLE I 



V. Active Deposits and Distance of Salts From the Electrodes. 



Measurements were also made on the active deposits obtained on the 

 electrodes at pressures of 760, 120, 25 and 5 mms. of mercury, when the 

 d'istance between the electrodes was maintained at 2 mms., and the salt 

 placed at a series of distances from the electrodes varying from 1.1 cms. 

 to 5 cms. These results are recorded in Table II, and curves illustrating 

 them are drawn in Figs. Ill, TV, V and VI. From the numbers given 

 and from the form of the curves it will l)e seen that for all pressures the 

 activity obtained on both electrodes steadily decreased as the distance 

 between the salt and the electrodes was increased. This result, it will 

 be seen, is somewhat different from that obtained by Euss with his ap- 

 paratus, for, as stated above, he found at certain pressures tliat the active 

 deposits slightly increased as the salt was removed, attained maximum 

 values at certain distances and finally fell away as the salt was still fur- 

 ther removed. 



