OP ARTS AND SCIENCES. 97 



very soluble in hot, less soluble in cold water. The air-dried salt lost 

 three and a half molecules of crystal water at 80°. 



I. 0.7087 grm. of the air-dried salt lost 0.0512 grm. H^O at 80". 

 II. 0.7273 grm. of the salt lost 0.0535 grm. 11,0 at 80°. 



III. 0.G244 grm. of the salt lost 0.0441 grm. H.,0 at 80°. 



IV. 0.G575 grm. of the anhydrous salt gave 0.1808 grra. Ba SO^ . 



Calculated for Ba(CaBr2l02)2 • 3^11^0. Found. 



I. II. III. 



HP 6.92 7.23 7.36 7.06 



Calculated for Ba(C3Br2lOo)2 • Found. 



Ba 16.17 . 1G.16 



The solubility of this salt in cold water was determined by V. 

 Meyer's method. The saturated solution was filtered, evaporated to 

 dryness, and the barium estimated by ignition with sulphuric acid. 



I. 2.6342 grms. of a solution saturated at 20° gave 0.1038 grm. 



BaSO, . 

 II. 2.0175 grms. of a solution saturated at 20° gave 0.0806 grm. 

 BaSO, . 



From these determinations the following percentages were calcu- 

 lated : — 



I. n. 



14.32 14.52 



Calcic dihromiodacrylate Ca(C3Br2l02)2« 



The calcium salt was made by saturating an aqueous solution of the 

 acid with calcic carbonate. From the concentrated solution the salt 

 crystallized in clustered needles which were less soluble in cold than 

 in hot water. When air-dried it was constant at 80°. 



0.4118 grm. of the salt dried at 80° gave 0.0714 grm. CaSO^ . 



Calculated for Ca(C3Br.J02)2 • Found. 



Ca 5.33 5.10 



Potassic dihromiodacrylate KC.jBr2l02 ? 



This salt was prepared by neutralizing an aqueous solution of the 

 acid with potassic carbonate and evaporating on the water bath. It 

 separated in the form of rhombic plates, which proved to be so deli- 



VOL. XVII. (N. S. XI.) 7 



