OF ARTS AND SCIENCES. 197 



tion. The air-dried salt contains four molecules of water, most of 

 which it loses over sulphuric acid, the rest at 100°. 



I. 1.9130 grm. of the air-dried salt lost, at 100°, 0.2824 grm. H 2 0. 

 II. 1.1010 grm. of the air-dried salt lost, at 170°, 0.1630 grm. H 2 0. 



H 2 



I. 0.3030 grm. of the salt dried at 170° gave 0.1740 grm. BaS0 4 . 

 II. 0.3293 grm. of the salt dried at 170° gave 0.1886 grm. BaS0 4 . 



Ba 



The solubility of the salt in cold water we determined according to 

 the method of V. Meyer. 



I. 27.6020 grm. of the solution saturated at 21° gave 0.2300 grm. 



BaS0 4 . 

 II. 27.9011 grm. of the solution saturated at 21° gave 0.2369 grm. 

 BaS0 4 . 



The aqueous solution saturated at 21°, therefore, contained the fol- 

 lowing percentages of the anhydrous salt : — 



I. II. 



1.45 1.48 



Calcic fi-Brom-8-Sidphopyromucate, CaC 5 HBrSO ti . 6 H 2 0. — The 

 calcium salt proved to be extremely soluble even in cold water. The 

 syrupy solution gradually solidified with the separation of long radi- 

 ating needles. The air-dried salt apparently contained six molecules 

 of water, five of which it rapidly lost over sulphuric acid. 



I. 1.2305 grm. of the air-dried salt lost, at 135°, 0.3193 grm. H 2 0. 



II. 0.4444 grm. of the air-dried salt gave 0.1413 grm. CaS0 4 . 



0.9631 grm. of the salt dried over sulphuric acid lost, at 135°, 0.0519 

 grm. H 2 0. 



Calculated for 

 CaC 5 HBrS0„ . H 2 0. Found. 



H 2 5.51 5.39 



