434 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



value for chlorine, was very close to 126.96 in every case, which is con- 

 siderably lower than the results obtained from the other two methods. 

 At about this time, however, Richards and Wells, working upon the 

 atomic weight of sodium in this laboratory, found that the atomic weight 

 of chlorine is in reality 35.467.* In the following table the results are 

 calculated upon this basis. 



The specific gravity of silver chloride was assumed to be 5.62, as re- 

 cently determined by Richards and StuU in this laboratory, and accord- 

 ingly a vacuum correction of +0.000073 was applied to every apparent 

 gram of salt. 



THE ATOMIC WEIGHT OF IODINE. 



Agl : AgCl. 

 Ag = 107.930 CI = 35.467 



The close agreement of the average of the last series with the averages 

 of the first two series leaves no doubt that the atomic weight of iodine is 

 very close to the final average of all three series, 1 26.975. Incidentally 

 this agreement is additional evidence in favor of Richards and Wells's 

 new value for the atomic weight of chlorine, 35.467. Further work is 



Tills investigation will soon be published. 



