24 THE ATOMIC WEIGHTS. 



110.361 

 110.360 

 110.360 

 110.342 

 110.346 

 110.338 

 110.360 

 110.336 

 110.344 

 110.332 

 110.343 

 110.357 

 110.334 

 "O.335 



Mean, 1 10.3463, dz .0020 



Combining this with Marignac's mean result, 110.343, ± 

 .005, we get a general mean of 110.3459, ± .0019. 



The ratios upon which we must depend for the atomic 

 weight of iodine are exactly parallel to those used for the 

 determination of bromine. 



To begin with, the percentage of oxygen in potassium 

 iodate has been determined by Millon.* In three experi- 

 ments he found : 



22.46 

 22.49 

 22.47 



Mean, 22.473, zfc .005 



Millon also estimated the oxygen in silver iodate, getting 

 the following percentages : 



17-05 

 17-03 

 17.06 



Mean, 17.047, rb .005 



The analysis of silver iodate has also been performed with 

 extreme care by Stas.f From 70 to 157 grammes were used 



* Ann. d. Chim. et d. Phys., (3,) 9, 400. 1843. 

 f Aronsteins' Translation, pp. 179-200. 



