122 THE ATOMIC WEIGHTS. 



amount of Jinhydrous chloride was computed from the data ho obtained. 

 The data, corrected to vacuum standards, are as follows : 



AjrCl. BaCl^. Ratio. ' 



f 8.7673 6.3697 72.653 ^ 



I 5-1979 3-7765 72.654 I 



A. ■{ 4-9342 3-5846 72.648 [- Mean, 72.649 



I 2.0765 I-5085 72.646 I 



[4-4271 3-2163 72.650 J 



r 2.09750 1.52384 72650 ^ 



]}. -' 737610 5.36010 72.669 Y Mean, 72.6563 



(5-39906 3-92244 72.650 3 



n (8-2189 5-97123 72.6524] ,,..,, 



C. -^ o r o r Mean, 72.6555 



1 4.5199 3.28410 72.6587 j '' ^^^ 



Mean, 72.653, i .0014 



If we assign Berzelius' work equal weight with that of Turner, the 

 tliree series representing the ratio 2AgCl : BaCl^ combine as follows • 



Berzelius 72.427, ± .0154 



Turner , 72.680, dz .0154 



Richards 72.653, zb .0014 



General mean 72.650, +; .0014 



Incidentally to some of his other work, Marignac* determined tlie 

 percentage of water in crystallized barium chloride. Two sets of three 

 experiments each were made, the first upon five grammes and the socond' 

 upon ten grammes of salt. The following are the percentages obtained : 



(14-790] 



A. j 14.796 ^ Mean, 14.795 

 ( 14.8003 



r 14.80 



B. -| 14.S1 y Mean, 14.803 



[14.80 

 Mean, 14.799, ± .0018 



The ratio between barium nitrate and barium sulphate has been de- 

 termined only by Turner, f According to his experiments 100 parts of 

 sulphate correspond to the following quantities of nitrate : 



112.060 

 1 1 1.990 

 112.035 



Mean, 112.028, ± .014 



For the similar ratio between barium chloride and barium sulphate, 

 there are available determinations by Turner, Berzelius, Struve, Marignac, 

 and Richards. 



* Journ. fiir Prakt. Chem., 74, 312. 1S5S. 

 tPhil. Trans., 1833, 538. 



