208 PROCEEDINGS OP THE AMERICAN ACADEMY 



I. 0.5460 grm. substance gave 0.2808 grm. CO., and 0.0299 grm. 



II. 0.4819 grm. substance gave 0.2494 grm. COj and 0.0253 grm. 

 H.O. 



III. 0.2511 grm. substance gave, by Cairus' method, 0.2910 grm. 



AgCI. 



IV. 0.2078 grm. substance gave, by Cairus' method, 0.2401 grm. 



AgCl. 

 V. 0.2089 grm. substance, precipitated by HCl, gave 0.1209 grm. 



AgCl. 

 VI. 0.6768 grm. substance, precipitated by HCI, gave 0.3909 grm. 



A-Cl. 



IT. V. VI. 



28.56 



43.55 43.49 



Baric Dichloracrylate, Ba(C,HC]202)o • H^O. The barium salt was 

 prepared by neutralizing the aqueous solution of the acid with baric 

 carbonate and concentrating the solution upon the water bath. On 

 cooling, the salt separated in rhombic plates which were permanent in 

 the air, and did not lose in weight over sulphuric acid in vacuo. 



I. 0.2185 grm. of the salt lost, when heated to 80°, 0.0088 grm 

 HjO and gave, on ignition with H^SO^, 0.1174 grm. BaSO^. 

 II. 0.1941 grm. of the salt gave, on ignition with H2S0^, 0.1041 

 grm. BaSO^. 



III. 0.2402 grm. of the salt gave, on ignition with HgSO^, 0.1281 



grm. BaSO^. 



IV. 0.9167 of the salt lost, when heated to 80°, 0.0395 grm. HjO. 



rv. 



4.31 



For the further characterization of this salt we determined its solu- 

 bility in cold water by the method of V. Meyer. 



I. 5.6625 grm. of an aqueous solution, saturated at 18°, gave, on 

 evaporation and ignition with H.,SO^, 0.1956 grm, BaSO^. 

 II. 2.416 grm. of a solution, saturated at 18°. 5, gave 0.0801 grm. 

 BaSO^. 



