298 Electromotive Forces developed from Zinc and Iodine. 



is found to be 13,000 calories. This is somewhat higher than 

 Naumann's number. 



Curves showing the E.M.F. of Solution of Zinc Iodide in Water, 

 and of Iodine in Zinc Iodide, 





130 



w 



128 



S 



126 



*i 



124 





122 



M» 



120 



o 



118 



P 



116 







n 



114 



a 



112 



i" 1 



110 







3 



108 



O 



106 







Efc 



104 







o 



102 



F 



100 





1)8 





96 





94 





92 





76 





74 





72 



W 



70 



S 



68 



« 



66 



s, 



64 



n 



t)9, 



1 



60 



2 



58 



VI 



56 







& 



54 



Q 



52 



O 



50 







v." -1 



48 



3 



46 



O 



44 



P 



42 







o 



40 



2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 



No. of D. grms. of Iodine in 1 cubic centim. of a "33 grm, sol. of Zinc Iodide. 



2 4 6 8 10 12 1416 18 20 22 24 26 28 30 32 34 36 38 40 



No. of Decigrammes of Znl 2 in 1 grm. of Water. 



It is evident from the above remarks and calculations, tha^ 

 any very close agreement between the numbers found in the 

 calorimeter and those found in the voltaic cell, even on the 

 assumption that Sir William Thomson's formula, T$ = Jed, is 

 true, cannot as yet be expected, and that therefore any theories, 

 based on the differences between these values, are at present 

 meaningless. 



