206 PROCEEDINGS OF THE AMERICAN ACADEMY 



I. 0.4478 grm. air-dried salt gave 0.1690 grm. BaS0 4 . 

 II. 0.8747 grm. air-dried salt lost at 110° 0.1030 grm. H 2 0. 



Calculated for Found. 



Ba(C 6 H 4 Br0 3 ) 2 . 4 H 2 0. I. II. 



Ba 22.20 22.19 



H 2 11.67 11.78 



0.3664 grm. salt dried at 110° gave 0.1558 grm. BaS0 4 . 



Calculated for Ba(C 6 H 4 Br0 3 ) 2 . Found. 



Ba 25.14 25.00 



The solubility of the salt in cold water was determined in the 

 usual way. 



I. 19.211 grm. of a solution saturated at 20°. 2 gave 0.0518 grm. 



BaS0 4 . 



II. 19.984 grm. of a solution saturated at 20°. 2 gave 0.0466 grm. 

 BaS0 4 . 



The aqueous solution saturated at 20°. 2 therefore contained the 

 following percentages of the anhydrous salt : — 



i. ii. 



0.63 0.55 



Calcic Brommethylpyromucate, Ca(C 6 H 4 Br0 3 ) 2 . 3 H 2 0. — The cal- 

 cium salt we prepared by precipitating with calcic chloride an 

 ammoniacal solution of the acid. It crystallized from hot water in 

 clusters of short needles which contained three molecules of water. 

 The salt was permanent in the air, and lost but little in weight 

 over sulphuric acid. 



I. 0.2508 grm. air-dried salt gave 0.0680 grm. CaS0 4 . 

 II. 5443 grm. air-dried salt lost at 110° 0.0584 grm. H 2 0. 



Calculated for Found. 



Ca(C 6 H 4 Br0 3 ), . 3 H 2 0. I. II. 



Ca 7.97 7.98 



H 2 10.76 10.73 



0.2724 grm. salt dried at 110° gave 0.0584 grm. CaS0 4 . 



Calculated for Ca(C H 4 BrO 3 ) 2 . Found. 



Ca 8.93 8.86 



In determining the solubility of the salt the calcium was precipi- 

 tated as oxalate, and converted into sulphate before weighing. 



