A REVISION OF THE ATOMIC WEIGHT OF IODINE. 



Ill 



nitrate had been retained by the iodide. Additional evidence upon this point is 

 afforded by the percentages of iodine and silver in silver iodide as given in Series 

 VIII and IX, for the sum of the two percentages is 0.999989, the discrepancy 

 being only a trifle greater than o.ooi per cent. The close agreement of the aver- 

 ages of the last six series makes it certain that no constant error of magnitude 

 still remains undetected in any one of the methods. One is forced, then, to con- 

 clude that the average of the last six series, 126.926, represents the atomic weight 

 of iodine within a very few thousandths of a unit. 



RATIO OF SILVER BROMIDE TO SILVER CHLORIDE. 



It is interesting, also, to compare the weights of silver bromide and silver 

 chloride produced in the same analysis. When this is done the ratio of silver 

 bromide to silver chloride and the atomic weight of bromine computed with the 

 assumed atomic weight of chlorine, 35.457, are found to be identical with the 

 corresponding values subsequently determined by Baxter.^ 



Series X. AgBr:AgCl. 



» See page 61. 



