RICHARDS. — ATOMIC WEIGHT OF BARIUM. 91 



the ratio of baric chloride to argentic chloride the most accurately 

 determined of all the old ratios; and in fact Turner in 1829 obtained 

 in this way a very good result (137.45). Upon the other hand, 

 Marignac's single result by this method (137.14) was much too low. 

 The description of his work is so superficial that a guess as to the 

 reason for this discrepancy is out of place ; nor is such a guess neces- 

 sary, for a single experiment can carry with it no important weight. 



The new result for the atomic weight of barium, reduced to the 

 various standards in present use, is given below. As before, the 

 mathematical statement of the " probable error " is omitted, because 

 this error is so small as to be meaningless. 



If Oxygen = 16.00, Barium = 137.44 



= 15.9G, " = 137.10 



" = 15.88, " = 136.41 



