BAHIUM. 121 



Pelouze 96.457, =b .0036 



Marignac 96.360, ± .0024 



Dumas 96.316, ± .0055 



Richards 96.520, ± .0025 



General mean 96.434, ± .0015 



The ratio between silver and crystallized barium chloride has also 

 been fixed by Marignac* The usual method was employed, and two 

 series of experiments were made, in the second of which the water of crys- 

 tallization was determined previous to the estimation. Five grammes of 

 chloride were taken in each determination. The following quantities of 

 BaCl.j.2H20 correspond to 100 parts of silver : 



r"3-io9'^ 



A. } 113. 135 ^ Mean, 113. 114 

 (113.097) 



r "3-135 ■) 



B. ) 113. 122 V Mean, 113. 106 

 (113.060 3 



Mean, 113. no, i .0079 



The direct ratio betAveen the chlorides of silver and barium has been 

 measured by Berzelius. Turner, and Richards. Berzelius f found of 

 barium chloride proportional to 100 parts of silver chloride — 



72.432 

 72.422 



Mean, 72.427 

 Turner X made five experiments, with the following results : 



72.754 

 72.406 

 72.622 

 72.664 

 72.653 



Mean, 72.680, ± .0154 



Of these, Turner regards the fourth and fifth as the best; but for 

 present purposes it is not desirable to so discriminate. 



Richards' determinations § fall into three series, and all are character- 

 ized by their taking into account chloride of silver recovered from the 

 wash w'aters. In the first series the barium chloride was ignited at low 

 redness in air or nitrogen ; in the second series it ^vas fused in a stream 

 of pure hydrochloric acid ; and in the third series it was not ignited at 

 all. In the last series it was weighed in the crystallized state, and the 



* Tourii. fiir Prakt. Chem., 74, 212. 1S58. 



t Poggend. Annalen, S, 177. 



X Phil. Trans., 1829, 291. 



'i Proc. Amer. Acad., 29, 55, 1S93. 



