284 PROCEEDINGS OP THE AMERICAN ACADEMY 



solution was obtained, from which, by evaporation, the barium salt 

 separated in elongated Hat prisms with oblique terminations. This 

 salt is much less soluble in cold than in hot water. The crystals which 

 separated from a hot solution were first dried to a constant weight in 

 the air, then heated to 80°. 



0.9545 grm. of the air-dried salt lost 0.0712 grm. Ii,0 at 80°. 

 0.8790 grm. of the anhydrous salt gave 0.3083 grm. BaSO^. 



Calculated for Ba(C3ClBr,02)2 • 3 IlaO. Found. 



lip 7.46 " ' 7.52 



Calculated for Ba(CsClBr202)». 



Ba 20.63 20.62 



The solubility of the barium salt in cold water was also determined. 



I. 1.4307 grm. of a solution saturated at 20° gave 0.1190 grm. 



BaSO,. 

 II. 2.5352 grm. of a solution saturated at 20° gave 0.214'2 grm. 

 BaSO,. 



These results correspond to the following percentages: — 



I. II. 



20.46 20.70 



Calcic a-CJilordihromaciylate, Ca(C3ClBr202)2 • 2i H^O. — The cal- 

 cium salt was prepared by neutralizing an aqueous solution of the acid 

 with calcic carbonate. From the concentrated solution the salt sepa- 

 rated in irregular branching needles, which lost two and one half mole- 

 cules of crystal water at 80°, after drying to constant weight in the air. 



I. 1.2644 grm. of the air-dried salt lost 0.1006 grm. 11,0 at 80°. 

 II. 0.9273 grm. of the air-dried salt lost 0.0714 grm. 11,0 at 80°.- 



Calculated for Found. 



Ca(C3ClBr202)2.2iH20. I. II. 



up 7.80 7.95 7.70 



I. 0.8166 grm. of the anhydrous salt gave on ignition with II^SO^ 



0.2016 grm. CaSO,. 

 II. 0.8328 grm. of the anhydrous salt gave 0.1835 grm. CaSO^. 



Calculated for Found. 



Ca<C3ClBr202)2. I- H- 



Ca 7.05 7.26 6.47 



Potassic a-Chlordihromacrylate, KCjClBr^O^? — A solution of the 

 acid was carefully neutralized with potassic carbonate, evaporated to a 



