140 PROCEEDINGS OF THE AMERICAN ACADEMY 



The solubility of the salt in water at ordinary temperatures we also 

 determined. 



I. 8.1035 grm. of a solution saturated at 18° gave on precipitation 



with H2SO4 0.1226 grm. BaSO,. 



II. 7.3943 grm. of a solution saturated at 18° gave on precipitation 



with H^SO, 0.1122 grm. BaSO,. 



The solution saturated at 18° therefore contained the following per- 

 centages of the anhydrous salt : — 



I. n. 



3.36 3.37 



Calcic h-Monohrompyromucate, Ca(C5H2BrO„)2 • 3 H^O. — The cal- 

 cium salt prepared by neutralizing an aqueous solution with calcic 

 carbonate formed small prisms clustered in globular aggregations 

 which were sparingly soluble iu cold water, somewhat more readily 

 in hot. 



I. 1.4814 grm. of the air-dried salt lost at 100° 0.1682 grm. Hp. 



II. 3.1181 grm. of the air-dried salt lost at 100° 0.3534 gnn. H^O. 



III. 0.2135 grm. of the air-dried salt gave on ignition with HgSO^ 



0.0614 grm. CaSO^. 



>r Found. 



III. 



8.47 



I. 0.3175 grm. of the anhydrous salt gave on ignition with H^SO^ 

 0.1032 grm. CaSO^. 

 II. 0.3939 grm. of the anhydrous salt gave on ignition with H^SO^ 

 0.1281 grm. CaSO^. 



Ca 



The solubility, of the calcium salt in water we determined by pre- 

 cipitating with ammonic oxalate the solution prepared according to the 

 method of V. Meyer, and converting the calcic oxalate thus obtained 

 into sulphate by ignition with sulphuric acid. 



I. 17.9259 grm. of a solution saturated at 20° gave 0.0620 grm. 



CaSO^. 

 II. 15.5795 grm. of a solution saturated at 20° gave 0.0528 grm. 

 CaSO,. 



