82 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



silver nitrate by the silver iodide. Furthermore, the agreement of the 

 results from silver bromide with those of the other series is an indica- 

 tion that the assumed atomic weight of bromine, 79.955, is very nearly 

 correct. However, from the weights of silver bromide and silver chlo- 

 ride produced in the same analyses, the atomic weight of bromine may be 

 computed. 



TABLE V. 



Series VII. AgBr : AgCl. 



Stas's value and the value obtained in this laboratory * are thus con= 

 firmed. A repetition of these experiments with precipitated fused silver 

 bromide is now under way. 



Shortly after the publication of my first paper upon the atomic weight 

 of iodine there appeared the complete paper of Kothner and Aeuer 

 upon the same subject.! These chemists, by determining the ratio Agl : 

 AgCl, obtained the value 126.93G (CI = 35.45 ; Ag = 107.93) as the 

 average of eight closely agreeing analyses. One synthesis, by precipi- 

 tating a weighed amount of silver with hydriodic acid, gave the value 

 126.978, and from one synthesis by heating a weighed amount of silver 

 in iodine the result 126.963 was obtained. A second paper t by the 

 same authors contains a recalculation of their results from the higher 

 value of chlorine 35.467, and a critical discussion of their own, Laden- 



* Richards, loc. cit. 



t Liebig's Ann., 337, 123 (1904). 



J Ibid., 337,362 (1904). 



