1888.] and the Minimum-point, fyc, of a Voltaic Couple, 303 



Table IV. 



Iodate, minimum point of change lay between 1 in 443 and 494. 

 Bromate, „ „ „ 1 „ 344 „ 384. 



Chlorate, „ „ „ 1 „ 221 „ 258. 



The minimum points of change of these three salts constitute a 

 series indicating a gradation of degree of chemical union of the 

 negative constituent of the salt with its base, feeblest in the iodate, 

 intermediate with the bromate, and strongest in the chlorate. The 

 more feebly united the negative constituent, the smaller was the 

 proportion of the salt required to disturb the voltaic balance. 



Table V.— KI in 465 grains of Water at 15° C. 



G-rains. 



Volts. 



Grains. 



Volts. 



Grains. 



Yolts. 



762 



1 -0584 



727 



1-1252 



692 



1-1728 



755 



1-0727 



720 



1 -1442 



685 





748 



1 -0784 



713 



1-1585 



678 





741 



1 -0899 



706 



1 -1728 







734 



1 -2071 



699 









The strongest solution was a saturated, one. 



Table VI.— Ditto, at 13° C. 



Grains. 



Yolts. 



Grains. 



Yolts. 



Grains. 



Yolts. 



678 

 594 

 510 



1 -1728 

 11899 

 1-1556 



426 

 342 

 258 



1-1556 



55 

 55 



174 

 90 

 6 



1-1556 



u 

 j> 



Table VII.— Ditto at 14° 0. 



Grains. 



Yolts. 



G-rains. 



Yolts. 



Grains. 



Yolts. 



6-00 

 5-49 



11556 

 11442 



4-89 

 4-29 



1 -0584 



» 



3-69 

 3-09 



1 0584 



