no 



RESEARCHES UPON ATOMIC WEIGHTS. 



This quantity, which was never more than o.i mg., was subtracted from the 

 original weight of silver, and no correction was applied to the weight of silver 

 iodide for the amount dissolved in the wash-water. 



DISCUSSION OF RESULTS. 



In the following table are summarized the results from the dififerent series: 



In computing the atomic weight of iodine from these data, Series I, II, and 

 III should obviously be neglected, since the experiments in these series are 

 superseded by the more accurate ones of Series VII and IX. 



In Series IV, V, and VE, the three chief possible errors have been considered 

 and shown to have no effect. Occluded silver nitrate in the silver iodide was 

 eUminated by fusion in iodine; and it was proved both that no volatilization of 

 the halides actually took place and that no halogen was retained by the solidified 

 salt. In Series VII, VIII, and IX, the chief possible error, that of occlusion of 

 silver nitrate by silver iodide, was avoided by sufficiently diluting the solutions 

 before precipitation. That the dilution was sufficient was evident from the 

 agreement of the results of the experiments with the larger and smaller quanti- 

 ties of material, the total voliune of the solutions being the same in all cases. 

 Furthermore, the weight of the silver iodide obtained in the analyses recorded in 

 Series VIII was in every case very nearly equal to the sum of the weights of silver 

 and iodine employed (Series VII), which could not have been the case if silver 



