BAXTER AND JONES. 



ATOMIC WEIGHT OF PHOSPHORUS. 



157 



Series I. 

 3 AgBr : Ag 3 P0 4 



A careful study of these results shows that the composition of silver 

 phosphate is very nearly, if not quite, independent of the changes in 

 the acidity of the solutions from which it is precipitated. Samples 

 and R were prepared under slightly more acid conditions than Sam- 

 ples N and P. The average amount of silver bromide obtained from 

 one gram of Samples and R is 1.34558 (77.297 per cent of silver), 

 whereas the average from Samples N and P is 1.34564 (77.301 per 

 cent of silver). This difference, if real and significant, is probably due 

 to a very slight occlusion of disiiver hydrogen phosphate . It does not 

 seem probable that any basic salt was present in Samples N and P, 

 because silver shows little tendency to form basic salts and the condi- 

 tions of precipitation were not favorable for the formation of basic 

 salts. 



The difference between composition of the samples is so slight, both 

 in absolute amount and by comparison with the differences between 



