164 RESEARCHES UPON ATOMIC WEIGHTS. 



The most important results of this research are as follows: 



1. Pure silver dichromate was prepared. 



2. It is shown that silver dichromate can not be completely dried without 

 decomposition. 



3. It is shown that silver dichromate when crystallized from nitric acid 

 retains traces of the nitric acid. 



4. The proportion of moisture and nitric acid in silver dichromate treated in 

 definite fashions was determined. 



5. The specific gravity of silver dichromate is found to be 4.770 at 25° C. 

 referred to water at 4** C. 



6. The per cent of silver in silver dichromate is found to be 49.9692. 



7. With two assumed values for the atomic weight of silver referred to oxy- 

 gen 16.000, the atomic weight of chromium is found to have the following 

 values: 



If Ag = 107.88 Cr = 52.01 



If Ag = 107.87 Cr = 52.00 



8. If these results are averaged with those previously found by Baxter, 

 Mueller, and Hines, the atomic weight of chromium is found to be as follows: 



If Ag = 107.88 Cr = 52.01 



If Ag = 107.87 Cr = 52.00 



