192 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



specific gravity at 25° referred to water at 4° was found to be 0.8G20. 

 Pains was taken to remove air from the arsenate when covered with 

 toluol by placing the pycnometer in an exhausted desiccator. 

 The following vacuum corrections were applied: 



Balance and Weights. 



All weighings were made upon a nearly new short-armed Troemner 

 balance, easily sensitive to one fiftieth of a milligram with a load of 

 fifty grams. 



The gold-plated Sartorius weights were several times carefully 

 standardized to hundredths of a milligram by the method described by 

 Richards, 11 and were used for no other work. 



SERIES I. 



3 AgCl 



Ag a AsO<. 



11 Jour. Amer. Chem. Soc, 22, 144 (1900) 



