BAXTER AND COFFIN. — ANALYSIS OF SILVER ARSENATE. 195 



SERIES VI. 



3 AgBr : Ag 3 As0 4 



Discussion of Results. 



The first point to be noted in the foregoing tables is that the results 

 can be divided into two distinct groups according to the samples of 

 arsenate employed, Series I, II, and III, with Samples A to E, giving 

 values for the per cent of silver in the arsenate lower than Series IV, V, 

 and VI, with Samples F and G. 



In the second place, both methods for determining the ratio of the 

 arsenate to the chloride give essentially identical results. This is 

 shown by the agreement of Series I and II, and that of Series IV and V. 



Finally, the per cent of silver in silver arsenate found in Series I and 

 II agrees within less than two thousandths of a per cent with that 

 found in Series III. This agreement, together with that of the indi- 

 vidual analyses of each series, indicates both uniformity in the material 

 employed and purity of the hydrochloric and hydrobromic acids, as 

 well as accuracy in the analytical work. The agreement of Series IV 

 and V with Series VI is closer still. 



In the following table are given the sources of the various samples 

 of silver arsenate: 



