RICHARDS. — ATOMIC WEIGHT OF BARIUM. 



59 



being further heated to bright redness. The alkalirnetric correction was 

 +0.25 milligram. 



(12.) 1.5 grams heated at 250° lost 1.0 milligram on fusion in a stream 

 of dry pure hydrochloric acid gas. No trace of alkali or acid was found 

 in the concentrated solution of the residue, but the addition of 0.10 cubic 

 centimeter of hundredth normal hydrochloric acid made the neutral solu- 

 tion perceptibly acid to methyl orange. 



(13.) 5.36 grams dried at dull redness lost no weight on fusion in 

 hydrochloric acid at bright redness. The residue was wholly neutral. 



(14.) 3.92 grams dried at dull redness lost 0.13 milligram on fusion in 

 hydrochloric acid. The heat was so great that the crucible was attacked. 



(15.) 4.28 grams of baric chloride dried at dull redness gained 0.23 

 milligram on partial fusion in hydrochloric acid. This specimen, as well 

 as the previous one, was absolutely neutral. 



Action of Heat on Baric Chloride. 



