414 



Dr. G. Gore on a New Method and 



The curves show : — 1st. A striking similarity of general 

 form, very different from that of the corresponding chloride, 

 bromide, and iodide ; this was probably chiefly due to the 

 general feebleness of the action. 2nd. A very small increase 

 of electromotive force in each case on adding the first portion 

 of substance, and on subsequent additions ; and the amounts 

 of these increases, contrary to what happened with other 

 groups of substances, varied directly as the magnitudes of the 

 molecular weights of the salts, but the degree of reversed 

 action was not conspicuous. 3rd. A sufficient difference of 

 form to characterize each substance. And 4th. The chemical 

 union of oxygen with the three corresponding halogen salts, 

 reduced the general electromotive force in each case, and the 

 amount of reduction varied inversely as the magnitudes of the 

 molecular weights of the salts (compare fig. 9). 



11. Curves of K 2 S0 4 and Na 2 S0 4 . 



The potassium salt was very pure ; the sodium one con- 

 tained traces of chloride. The solutions were of the same 

 range of degrees of strength as those of the halogen salts of 

 the same metals, viz. from *1 to 1*0 grain of salt in 155 grains 

 of water. 



Fig. 13. 

 Curve of K 2 S0 4 at 14-5° C. 



