61 



Mean, 14.795, ± .0019 Mean, 14.803, dr .002 



General mean of both series, 14.799, i .0014 



The ratio between barium nitrate and barium sulphate 

 has been determined onl}- by Turner.* According to his 

 experiments 100 parts of sulphate correspond to the follow- 

 ing quantities of nitrate; 



112.060 

 1 1 1.990 

 112.035 



Mean, 112.028, i .014 



For the similar ratio between the sulphate and the chlo- 

 ride there are experiments by Turner, Berzelius, Struve, 

 and Marignac. Turnerf found that 100 parts of chloride 

 ignited with sulphuric acid gave 112.19 parts of sulphate. 

 By the common method of precipitation and filtration a 

 lower figure was obtained, because of the slight solubility of 

 the sulphate. This point bears directly upon many other 

 atomic weight determinations. 



Berzelius,! treating barium chloride with sulphuric acid, 

 obtained the following results in BaS04 for 100 parts of 

 BaCl^: 



112. 17 



112. 18 



Mean, 112. 175, zh .0034 



Struve, II in two experiments, found : 



112. 0912 

 112.0964 



Mean, 112.0938, ± .0018 



■■■Phil. Trans., 1833, 53S. 



f Phil. Trans., 1829, 291. 



X Poggend. Annal., 8, 177. 



II Ann. Chem. Pharm., 80, 204. 1851. 



