Chemical Affinity in terms of Electromotive Force. 187 



zero); and consequently as long as CR was less than 0*01 volt 

 (i. e. as long as R did not exceed 100 ohms and C 0*0001 

 weber) the first sudden motion was less than 0*5 scale-division 

 and was consequently practically inappreciable. 



(I.) Surface of each platinum electrode 3*2 square centims. 

 Value of R = 7'6 ohms ; C = '000005 to -0001 weber ; so that 

 CR was quite negligible ; value of E at moment of rupture of 

 current =1*60 volt (average). The following numbers were 

 obtained as the average of a number of concordant observations; 

 the differences between the values obtained on repetition of an 

 experiment were, as might be expected, much greater in the 

 experiments of the A class than in the others. 



Fall of E in volts. 









C. 









Voltameter 





A. 



B. 



charged with 



Time in seconds 

 since rupture of 



Unboiled acid. 



Acid well boiled 

 and used as soou 



acid saturated 

 with hydrogen 



current. 





as cold. 



and oxygen at 

 the two elec- 

 trodes respec- 

 tively. 



5 



•25 



•20 



•09 



10 



•33 



•25 



•13 



15 



•39 



•32 



•15 



20 



•43 



•37 



•17 



30 



•48 



•45 



•20 



60 



•59 



•58 



•26 



120 



•70 



•70 



•33 



180 



■75 



•75 



•35 



(II.) Surface of each electrode 8'0 square centims. Value 

 of R = 11-2 ohms, current '000005 to '0001 weber ; so that 

 CR was practically negligible. Average value of E at moment 

 of rupture of current 1*80 volt. 



Fall of E in volts. 



Time in seconds. 



A. 



B. 



C. 



5 



•26 



•22 



•19 



10 



•33 



•27 



•23 



15 



•39 



•30 



•25 



20 



•43 



•32 



•26 



30 



•48 



•36 



•28 



60 



•52 



•38 



•29 



120 



•56 



•40 



•295 



180 



•58 



•41 



•30 



In precisely the same way analogous numbers were obtained 

 in many other series of experiments, the details of which it is 

 unnecessary to quote. Whether the electrodes were of gold, 



