96 



PROCEEDINGS OF THE AMERICAN ACADEMY 



Crystalline Form of Dibromiodacrtlic Acid. 



001 



no 



lip 



OOI 



MoNOCLiNic System. 



Forms {001}, {010}, {110}, {121}, {111}.=' 



Elements : — Clinodiagonal, « = 0.617 

 Orthocliagonal, b = 1. 

 Vertical Axis, c = 0.581 

 Angle of Axes = 52° 11|' 



The following salts of this acid have been examined : — 



Baric dibromiodacrylate Ba(C3Br^J02)2 • S^H^O. 



To prepare the barium salt, a solution of the acid was neutralized 

 with baric carbonate and the filtered solution concentrated by evapora- 

 tion. On cooling the salt crystallized in rhombic prisms, which were 



* Tlie form jlll ^ appeared only on a few crystals. 



