298 Mr. G. Gore. On the Change of Potential of a [June 14 



Table IV.— Ditto at 8° C. 



Grains. 



Volts. 



G-rains. 



Volts. 



0-003 



1-1546 



'001001 



1 0228 



'002667 



1 -1171 



-000660 



-9942 



0-002334 



1 -0543 



-000336 



0-937 



-002001 



1-0943 



-000224 



>j 



0-001668 



1-080 



-000112 



>> 



-001335 



1 -0514 



"Water. 





The electromotive force gradually increased with the strength of 

 the solution up to 0*002 grain of the salt, then decreased, and after- 

 wards increased again up to 0*003 grain, and then remained constant 

 until the saturation point was attained. The total increase of electro- 

 motive force was 0'21736 volt. The minimum proportion of chloride 

 necessary to upset the balance of potential of the couple lay between 

 1 part in 695,067 and 1,390,134 parts. 



Table V.— HC1 in 465 grains of Water at 16*5° C. 



G-rains. 



Volts. 



Grains. 



Volts. 



0-15 



1 -3487 



-05628 



1-1715 



0-1407 



1 -2945 



0*04691 





0-1313 



1 -2459 



-03754 



1-1658 



-1219 



1 *2373 



-02816 



1-1515 



0*1125 



1*1915 



-01879 



1 -1429 



0-10314 



1 -1615 



-00942 



1-1286 



-09377 









55 







-0844 



55 



-00005 



1 -0228 



-075^2 





-0000474 



-9799 



06565 



35 



Water^ 



55 



The electromotive force increased gradually with the strength of 

 the solution up to 0*06505 grain of the anhydrous acid, then remained 

 constant until - 10314 grain had been added, and then increased up 

 to the strongest solution employed. The total increase of electro- 

 motive force was 0-3688 volt. The smallest proportion of the anhydrous 

 acid required to disturb the balance of the couple lay between 1 part 

 in 9,300,000 and 9,388,185 parts of water. 



