OF ARTS AND SCIENCES. 371 



II. 0.7064 grm. of the air-dried salt lost at 100° 0.0227 grm. H 2 0. 

 III. 0.4898 grm. of the air-dried salt gave 0.1951 grm. BaS0 4 . 



Found. 

 I. 11. III. 



3.21 3.21 



23.42 



I. 0.5258 grm. of the salt dried at 100° gave 0.2149 grm. BaS0 4 . 

 II. 0.4787 grm. of the salt dried at 100° gave 0.1955 grm. BaS0 4 . 



Calculated for Found. 



Ba(C 7 lI 4 Br0 3 ) 2 . I. II. 



Ba 24.07 24.02 24.01 



Calcic Bromfurfuracrylate, Ca(C-H 4 Br0 3 ) 2 . 3 H 2 0. — This salt crys- 

 tallizes in columnar aggregations of plates, and is sparingly soluble in 

 cold water, more readily in hot water. The air-dried salt effloresces 

 over sulphuric acid, and is gradually decomposed at 100°, but may be 

 dried without difficulty at 80-85°. 



I. 1.1639 grm. of the air-dried salt lost at 82° 0.1184 grm. H 2 0. 

 II. 0.7362 grm. of the air-dried salt lost at 83-85° 0.0740 grm. H 2 0. 

 III. 0.6331 grm. of the air-dried salt gave 0.1648 grm. CaS0 4 . 

 IV. 0.5287 grm. of the air-dried salt gave 0.1375 grm. CaS0 4 . 



Calculated for Found. 



Ca(C 7 H 4 Br0 3 ) 2 . 3 H 2 0. I. II. III. IV. 



H 2 10.07 10.17 10.05 



Ca 7.61 7.65 7.65 



0.6123 grm. of the salt dried at 82° gave 0.1774 grm. CaS0 4 . 



Calculated for 



Ca(C 7 H 4 Br0 3 ) 2 . Found. 



Ca 8.47 8.52 



Sodic Bromfurfuracrylate, NaC 7 H 4 Br0 3 . — This salt is readily soluble 

 even in cold water, and crystallizes in anhydrous nodular aggregations. 



I. 0.7612 grm. of the salt gave 0.2228 grm. Na 2 S0 4 . 

 II. 0.7589 grm. of the salt gave 0.2206 grm. Na 2 S0 4 . 



Calculated for Found. 



NaC 7 H 4 Br0 3 . I- H. 



Na 9.62 9.48 9.42 



Argentic Bromfurfuracrylate, AgC r II 4 BrO r — The silver salt, formed 

 by the addition of argentic nitrate to a neutral solution of the ammo- 

 nium salt, proved to be nearly insoluble in water, and was apparently 

 amorphous. 



I. 0.3919 grm. of the salt gave 0.2261 grm. AgP»r. 

 II. 0.4065 grm. of the salt gave 0.2347 grm. AgBr. 



