OP ARTS AND SCIENCES. 287 



I. 0.2623 grm. substance dried at 75° gave 0.1970 grm. AqCl. 

 11. 0.2070 grm. substance dried at 75° gave 13.8 c.c. of moist nitro- 

 gen at 25° under a pressure of 762 mm. 



Calculated for Found 



CeU.OlNOj. I. II. 



CI 18.5i 18.57 



N 7.31 7.45 



^y-DlCHLOR-8-SuLPHOPTROMUCIC AciD. 



/3y-dichlorpyromucic acid dissolves without charring in fuming sul- 

 phuric acid, and in the course of a few hours is converted into the 

 corresponding sulphonic acid. The barium salt obtained by neutraliz- 

 ing the diluted solution with baric carbonate is quite readily soluble 

 in cold water, but it can be purified without difficulty by recrystalliza- 

 tion from hot water. The free acid crystallizes in mdistinct radiating 

 needles, and deliquesces rapidly when exposed to the air. 



Baric /3y-DicAIor-8-SuIphopyromucate, 'Ba.C^Cl.^SOg . 5 HgO. 



This salt is very readily soluble in hot water, less soluble in cold 

 water, and separates as the hot solution cools in globular aggrega- 

 tions of radiating needles which contain five molecules of water. The 

 salt is permanent in the air, but slowly effloresces over sulphuric acid. 

 It loses a part of its water at 100°, but a temperature of 180° appears 

 to be necessary for complete dehydration. 



I. 0.4258 grm. air-dried salt gave 0.2045 grm. BaSO^. 

 II. 1.0938 grm. air-dried salt gave 0.5239 grm.BaS04. 



III. 1.5844 grm. air-dried salt lost at 185° 0.2930 grm. H.,0. 



IV. 0.9712 grm. air-dried salt lost at 190° 0.1792 grm. HoC. 



Calculated for Found. 



BaCsCUSOa.SH^O. I. II. III. IV. 



Ba 28.19 28.23 28.16 



H2O 18.52 18.49 18.45 



I. 1.0167 grm. salt dried at 185° gave 0.5970 grm. BaSOi. 

 II. 0.6549 grm. salt dried at 190° gave 0.3837 grm. BaSOi. 



Calculated for Found. 



BaC,:;Cl2SOo I. II. 



Ba 34.59 34.52 34.44 



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

 usual manner. 



I. 18.7100 grm. solution saturated at 18° gave 1.0970 grm. BaSO^. 

 II. 21.2012 grm. solution saturated at 18° gave 1.2458 grm. BaSO^. 



