466 



PROCEEDINGS OP THE AMERICAN ACADEMY. 



the salt displaced 0.2004 and 0.1699 gram of benzol respectively, 

 therefore the two results (since the benzol had the specific gravity 0.880 

 referred to water at 4°) were 4.382 and 4.378 respectively, the mean 

 value being 4.380. The temperature was 20°. This value was used in 

 correcting the weight of caesic bromide to the vacuum standard. 



Comparison of Caesic and Argentic Bromides. 



Ag = 107.93 ; Br = 79.955. 



Comparison of Caesic Bromide and Silver. 

 Ag = 107.93; Br = 79.955. 



The agreement of these analyses with one another and with the pre- 

 vious results seems to indicate their trustworthiness. Further emphasis 

 may belaid upon this consistency by pointing out that the 8.55748 grams 

 of silver produced 14.8970 grams of argentic bromide, which must then 

 have contained 57.444 per cent of silver. Stas found 57.445 per cent, or 

 essentially the same value. 



