( 337 ) 



The values uf' the electrical reaction vclücitij conatant, ifj, are 

 placed in the hist column of the following table, which contains 

 the results of the observations. 



A',- 



^i + Ha 



0,0167 



0,0178 

 0,0184 

 0,0185 

 0,0175 

 0,0125 

 0,0088 

 0,0042 

 



The observations cannot be continued below — 5° because the 

 orvohydratic temperature of Zn SO; . 7 Hj lies at about — 6°. 



Representing- the values of A'l graphically as a function of the 

 temperature the followiug curve is obtained. 



Proceedings Royal Acad. Amsterdam Vol I. 



Temitfratiin: 



23 



