OF ARTS AND SCIENCES. 217 



I. 11.4429 grm. of a solution, saturated at 20°, gave, after neutrali 



zation with BaCOj and evaporation with H^SO^, 0.0597 grm. 

 BaSO,. 

 n. 12.7846 grm. of a solution, saturated at 20°, gave 0.0643 grm. 

 BaSO,. 



According to these determinations, the aqueous solution of the acid 

 saturated at 20° contains the following percentages : — 



I. II. 



1.38 1.33 



Baric Tribromacrylate, BaC8Brg02.3H20. The barium salt we 

 made by neutralizing the acid with a solution of baric hydrate. On 

 cooling the concentrated solution, it crystallizes in long needles, which 

 effloresce over sulphuric acid. 



I. 0.7888 grm. of the air-dried salt lost over HjSO^ 0.0532 grm. 

 H,0. 



II. 0.7585 grm. of the air-dried salt lost in vacuo over HgSO^ 



0.0506 grm. H^O. 



III. 0.4900 grm. of the air-dried salt lost at 80° 0.0324 grm. HgO. 



IV. 0.7024 grm. of the anhydrous salt gave, on ignition with H^SO^, 



0.2185 grm. BaSO,. 

 V. 0.4486 grm. of the anhydrous salt gave 0.1398 grm. BaSO^. 



Calculated for BaCCsBrjOjlj.SH^O. Found. 



I. n. m. 



H^O 6.68 6.75 6.67 6.61 



Calculated for Ba(C3Br302)2> Found. 



IV. V. 



Ba 18.20 18.29 18.32 



The solubility of this salt in cold water was determined by the 

 method of V. Meyer. 



I. 3.2130 grm. of a solution saturated at 20° left, on evaporation 

 with H2SO4 and ignition, 0.2349 grm. BaSO^. 

 II. 2.9600 grm. of a solution saturated at 20° gave 0.2170 grm. 

 BaSO,. 

 The aqueous solution saturated at 20° therefore contained the fol- 

 lowing percentages of the anhydrous salt : — 



I. II. 



23.62 23.69 



Calcic Trihromacrylate Ca(C3Br302)2-H20. The calcium salt was 

 made by warming the acid with water and calcic carbonate. It crys- 



