374 PROCEEDINGS OF THE AMERICAN ACADEMY 



H 2 



I. 0.2130 grin, of the anhydrous salt gave 0.0684 grm. BaS0 4 . 



II. 0.2229 grm. of the anhydrous salt gave 0.0712 grm. BaS0 4 . 



III. 0.4376 grm. of the anhydrous salt gave 0.1398 grm. BaS0 4 . 



Calculated for Found. 



Ba(C 7 H 3 Br 2 3 ) 2 . I. II. III. 



Ba 18.85 18.88 18.78 18.78 



Argentic Bromfurfurbromacrylate, AgC 7 H 3 Br 2 3 . — The silver salt 

 made by precipitation is very sparingly soluble even in boiling water, 

 and is apparently amorphous. 



I. 0.2052 grm. of the salt dried over sulphuric acid gave 0.0951 

 grm. AgBr. 

 II. 0.2101 grm. of the salt dried over sulphuric acid gave 0.0977 

 grm. AgBr. 



Calculated for Found. 



AgC,H 3 Br 2 0j. I. II. 



Ag 26.80 26.62 26.71 



Potassic Bromfurfurhromacrylate, KC 7 H 3 Br 2 3 . — The potassium salt 

 is sparingly soluble in cold water, more readily soluble iu hot water, 

 and crystallizes in slender clustered needles which are anhydrous. 



I. 0.2275 grm. of the salt gave 0.0589 grm. K 2 S0 4 . 

 II. 0.5386 grm. of the salt gave 0.1407 grm. K 2 S0 4 . 



Calculated for Found. 



KC 7 H s Br 2 0,. I. n. 



K 11.70 11.62 11.72 



Ethyl Bromfurfurbromacrylate, C 7 H 3 Br 2 3 . C 2 Hj. — The ethyl ether 

 was made by heating for three hours on the water bath a solution of 

 the acid (4 parts) in absolute alcohol (40 parts), with the addition of 

 a small amount (3 parts) of concentrated sulphuric acid. The ether 

 was then precipitated with water, washed with a dilute solution of 

 sodic carbonate, and recrystallized from ligroin. It crystallized easily 

 in radiated needles which melted at 55-56° and dissolved readily in 

 alcohol, ether, chloroform, benzol, ligroin, or carbonic disulphide. 



I. 0.3774 grm. of substance gave 0.4592 grm. C0 2 and 0.0849 

 grm. H 2 0. 

 II. 0.2125 grm. substance gave 0.2464 grm. AgBr. 

 III. 0.2179 grm. substance gave 0.2525 grm. AgBr. 



