Chemical Affinity in terms of Electromotive Force. 295 



B. With two opposed Daniell cells, the copper plates being 

 united and the zinc plates the terminal ones, the following 

 values were obtained. The probable error of each value cited 

 is less than in the electrometer-experiments, being usually 

 well within ±'5 millivolt, often no more than +*25 millivolt. 



Value of m. 



Value of n. 



3-995 



3-005 



2-158 



1-016 



•497 



•1012 



5-584 

 3-995 

 3-005 

 2158 

 1-016 

 •497 



10-5 



161 

 5-6 



20-2 

 9-7 

 4-1 



26-7 



16-2 



10-6 



6-5 



32-3 

 21-8 

 16-2 

 121 

 5-6 



43-3 



32-8 

 27-2 

 23-1 

 16-6 

 110 



C. With Diffusion-cells the following values were obtained: 

 probable error of each value less than ±*5 millivolt : — 



Value of m. 



Value of n. 



3-95 



3-10 



2-00 



•96 



•50 



•237 



5-25 

 3-95 

 3-10 

 200 

 •96 

 •50 



6-8 



12-4 

 5-6 



18-4 



11-6 



6-0 



24-7 



17-9 



12-3 



6-3 



292 

 224 

 16-8 

 10-8 

 4*5 



35-0 

 28-2 

 22-6 

 16-6 

 10-3 

 5-8 



On graphical representation all three sets of figures are 

 found to accord fairly well when, by interpolation, the figures 

 are all reduced to a common origin for the three curves, viz. 

 when m=5'0. The following table gives the result thus re- 

 duced to common origin and the same abscissae. 





Electrometer. 



Two opposed 



cells. 



Diffusion- 

 cells. 



Average. 



5-584 



5-25 



5-1 



5-0 



40 



30 



2-0 



1-0 

 •5 



•237 

 •167 

 •100 



-"6 : 4 

 



4-8 

 11-6 

 16-3 

 23-5 

 28-7 

 34-9 

 36-6 



- 3-8 



"o" 



6-7 

 12-3 

 17-3 

 23-1 



28-5 

 35-7 



37-7 



39-5 



- 



- 1-3 



"o" 



5-2 

 11-6 

 17-1 

 23-1 

 27'9 

 33-7 







5-6 

 11-8 

 16-9 

 23-2 

 28-4 

 34-8 

 37-2 

 39-5 



