OF ARTS AND SCIENCES. 135 



According to these determinations the aqueous solution saturated at 

 18° contained the following percentages: — 



I. II. 



4.95 4.97 



Baric Dibromacrylate, Ba(C„HBr.,0.,)2 . H.^O. The barium salt made 

 by neutralizing a solution of the acid with baric carbonate crystallized 

 in rhombic plates more or less irregular in form, which when dried by 

 exposure to the air contained one molecule of water. 



I. 1.3641 grm. of salt dried over IIoSO^ gave by precipitation 

 0.5195 grm. BaSO, . 

 II. 3.1482 grms. of the air-dried salt lost at 110° 0.0933 grm. 11,0; 

 0.8202 grm. of the same air-dried salt gave by precipitation 

 0.3147 grm. BaSO, . 

 III. 1.7219 grm. of salt dried over H,SO^ lost at 120'' 0.0520 grm. 

 H^O ; 0.6769 of the same salt gave by precipitation 0.2555 

 grm. BaSO^. 



Calculated for Ba(C8nBrA)2 • HoO . 



I. 

 Ba 22.35 22.40 



H.p 2.94 



For its further identification we determined its solubility in water 

 at 18°. 



9.2373 grm. of a solution saturated at 18° gave by precipitation 

 0.2131 grm. BaSO,. 



From this determination it follows that the aqueous solution satu- 

 rated at 18° contained 5.89% of the anhydrous salt. 



Calcic Dibromacrylate, Ca(C3HBr,02)., . 3H.,0. The calcium salt 

 crystallized in clustered needles which contained three molecules of 

 water of crystallization when dried by exposure to the air. 



I. 0.5761 grm. of the air-dried salt lost at 80° 0.0535 grm. H.,0. 

 II. 0.5101 grm. of the air-dried salt lost at 80° 0.0491 grm. H^^O. 



Calculated for Ca(C3HBr.20.2)2 . SH^O. Found. 



I. II. 



HjO 9.78 9.29 9.63 



0.4608 grm. of the salt dried at 80° gave on ignition with H,SO^ 

 0.1262 grm. CaSO,. 



