60 THE ATOMIC WEIGHTS. 



A. B. 



113109 113-135 



113.135 II3.122 



113.097 113.060 



Mean, 113. 114, ±: .0074 Mean, 113. 106, ~ 0154 



The general mean from both series is 113.113, zb .0067. 



The direct ratio between the chlorides of silver and 

 barium was early established both by Berzelius* and Tur- 

 ner.f Berzelius found that 100 parts of dry barium chlo- 

 ride gave of silver chloride: 



13S.06 

 138.08 



Mean, 138.07, ± .007 



Turner made five experiments, with the following results : 



137-45 

 137-54 

 137-70 

 137.62 



137-64 



Of these. Turner regards the fourth and fifth as the most 

 exact. These give a mean of 137.63, ±: .007, while the 

 other three are in mean 137.563, ± .049. Combining Ber- 

 zelius' figures with those of Turner, Ave get as follows : 



Berzelius 138.07, ± .007 



Turner, i, 2, 3 137-563. ± -049 



" 4,5 137-63. ±-007 



General mean 137.841, ± .0047 



Incidentally to some of his other Avork Marignac| deter- 

 mined the percentage of water in crystallized barium chlo- 

 ride. Two sets of three experiments each Avere made, the 

 first upon five grammes and the second upon ten grammes 

 of salt. The following are the percentages obtained : 



* Poggend. Annal., 8, 177. 



t Phil. Trans., 1829, 291. 



JJourn. f. Prakt. Chem., 74, 212. 1858. 



