ROSA, VINAL AND McDANIEL I THE SILVER VOLTAMETER 45 



noted by some earlier observers. The reasons why the salt recrys- 

 tallized and fused according to the well known researches of 

 Richards and Forbes (although well suited for their purposes of 

 atomic weight determinations) is not suitable for use in the 

 voltameter can only be given adequately in the complete paper 

 to be published in Bulletin of the Bureau of Standards. It must 

 suffice here to say that the authors have carefully followed their 

 procedure and found the product unsuited for the voltameter, 

 first because of the slight decomposition resulting from the pro- 

 longed fusion, and second because of the basicity formed from 

 the repeated recrystallizations from neutral solutions. 



In the fourth and last paper of this series the results subse- 

 quent to the work of the International Technical Committee will 

 be given. These include experiments to determine the value of 

 the Weston Normal Cell made with the highest precision and a 

 discussion of the action of acid and base in the voltameter. 



