OP ARTS AND SCIENCES. 215 



I. 0.4G60 ffrm. of air-dried salt lost in vacuo over H„SO, 0.0360 

 grm. HjjO, and lost then nothing at 80°. 

 II. 0.2832 grm. of air-dried salt lost in vacuo over H^SO^ 0.0208 

 grm. HjO, and afterwards, when heated to 80°, 0.0011 grm. 



Calculated for Ba(CsHBrI0j),.3Hj0. Found. 



I. II. 



HgO 7.27 7.73 7.35 



0.4427 grm. of the dried salt gave, on ignition with H^SO^, 0.1498 

 grm. BaSO^. 



Calculated for Ba(CsHBrlOj),. Found. 



Ba 19.88 19.90 



The solubility of the salt in cold water we also determined. 

 I. 2.0G36 grm. of a solution saturated at 20° gave, on evaporation 

 with H.SO^, 0.0967 grm. BaSO^. 

 II. 3.0991 grm. of a solution saturated at 20° gave 0.1457 grm, 

 BaSO,. 



From these determinations it follows that the aqueous solution, 

 saturated at 20°, contains the following percentages of the anhydrous 



salt : — 



I. II. 



13.86 13.90 



Calcic lodhromacrylate, Ca(C3HBrI02)2-3jH^O. The calcium salt 

 resembles the barium salt closely in appearance, but is more soluble in 

 water. The air-dried salt loses its crystal water completely in vacuo 

 over sulphuric acid, or when heated to 80°. 



I. 0.7622 grm. of the air-dried salt lost 0.0771 grm. H.O at 80°. 

 II. 0.7172 grm. of the air-dried salt lost 0.0698 grm. H^O at 80°. 



Calculated for Ca(C3HBrIOij)2.3JH20. Found. 



I. II. 



HgO 9.89 10.12 9.73 



0.6518 grm. of the salt dried in vacuo gave, on ignition with HjSO^ 

 0.1465 grm. CaSO^. 



Calculated for Ca(C3HBrI0j)2. Found. 



Ca 6.76 6.61 



Argentic lodbromacrylate, AgCgHBrlOa- The silver salt was pre- 

 cipitated from an aqueous solution of the acid by the addition of ar- 

 gentic nitrate. It formed short, clustered needles, which could be 

 recry stall ized from water, with but little decomposition. 



