126 THE ATOMIC WEIGHTS. 



And for barium itself, four values are finally available, thus : 



From molecular weight BaCl 2 Ba = 136.271, .0106 



From molecular weight BaBr. 2 " = 136.390, .0141 



From ratio (5) " 135.600, rb .2711 



From ratio (6) " = 136.563, .0946 



General mean Ba = 136.315, d= .0085 



Or, if = 16, Ba = 137.354. 



In the foregoing computation all the data, good or bad, are included. 

 Some of them, as shown -by the weights, practically vanish ; but others, 

 as in the chloride series, carry an undue influence. A more trustworthy 

 result can be deduced from Richards' experiments alone, which reduce 

 as follows : 



From Ag 2 : BaCl 2 BaCl 2 = 206.761, .0080 



From 2AgCl : BaCl 2 " = 206.754, .0067 



General mean BaCl 2 = 206.755, 



From the bromide, as given above, Ba = 136.390, dz .0141. From the 

 value just found for the chloride, Ba 136.397, .0109. Combining 

 the two values 



Ba = 136.392, .0086. 



Or, if = 16, Ba = 137.434. This determination will be adopted in 

 subsequent calculations as the most probable. 



