OP ARTS AND SCIENCES. 169 



Calculated for Found. 



Ba(U5UBr.,03)2. I. II. 



Ba 20.3U 20.44 19.93 



The solubility of the salt in cold water we determined by precipi- 

 tating the saturated solution with sulphuric acid. 



I. 41.9064 grm. of a solution saturated at 20° gave 0.0521 grm. 

 BaSO,. 

 II. 37.7244 grm. of a solution saturated at 20° gave 0.0449 grm, 

 BaSO,. 



The aqueous solution saturated at 20° therefore contained the fol- 

 lowing pei'centages of the anhydrous salt : — 



I. II. 



0.36 0.34 



Calcic PyDibrompyromucate, Ca(C.HBr20g)2. 5 H^O. — The calcium 

 salt we made by boiling the acid with water and adding calcic car- 

 bonate. The salt recrystallized from boiling water formed concen- 

 trically grouped needles, which effloresced slowly in the air, rapidly 

 over sulphuric acid. 



I. 1.7504 grm. of the salt lost at 120° 0.2330 grm. H,0. 

 II. 2.4934 grm. of the salt lost at 120° 0.3300 grm. H,0. 



Calculated for Found. 



Ca(C5lIBr,,03)o.5H.,0. I. II. 



HgO 13.47' ' 13.31 13.23 



I. 0.5620 grm. of the anhydrous salt gave on ignition with HoSO^ 

 0.1301 grm. CaSO,. 

 II. 0.8701 grm. of the anhydrous salt gave on ignition with IlgSO^ 

 0.2011 grm. CaSO,. 



Calculated for Found. 



Ca^C,-,Iinr..03)2. I. II- 



Ca 6.92 ' 6.81 6.80 



The solubility of the salt in water at ordinary temperatures we 

 determined by precipitating a saturated solution with amnionic oxalate, 

 and igniting the calcic oxalate thus obtained with sulphuric acid. 



I. 20.5686 grm. of a solution saturated at 20° gave 0.0561 grm. 

 CaSO,. 

 II. 19.7985 grm. of a solution saturated at 20° gave 0.0538 grm. 

 CaSO.. 



