240 



PROCEEDINGS OF THE AMERICAN ACADEMY 



I. 0.4981 grm. air-dried salt gave 0.0762 grm. H,0 at 80°. 



II. 0.6211 grra. air-dried salt gave 0.0956 grm. Hfi at 80°. 



III. 0.4219 grm. anhydrous salt gave 0.1424 grm. CaSO^. 



IV. 0.5096 grm. anhydrous salt gave 0.1713 grm. CaSO^. 



Calculated for Ca(C3ClBr02H)2.4H20. 



H^O 14.97 



Calculated for Ca{C3ClBr02H), 



Ca 9.78 



I. 



15.30 



in. 

 9.93 



Found. 



Found. 



n. 

 15.39 



IV. 



9.87 



Argentic Chlorbromacrylate, Ag(C3ClBr02H)2. This salt was pre- 

 cipitated by the addition of argentic nitrate and ammonic hydrate to 

 a solution of the acid. It forms microscopic needles, which are almost 

 insoluble in cold water. 



I. 0.2760 grm. salt gave 0.1337 grm. AgCl. 



11. 0.3445 grm. salt gave 0.1668 grm. AgCl. 



Potassic Chlorhromacrylate, KCgClBrOjH. This salt forms clusters 

 of irregular, pointed, anhydrous prisms, which are less soluble in cold 

 than in hot water. 



0.5346 grra. salt, dried at 80°, gave 0.2132 grm. K^SO^. 



K 



Calculated for KCaClBrO^H. 



17.49 



Found. 



17.91 



The addition of bromine to chlorbromacrylic acid takes place very 

 readily at the ordinary temperature, with the formation of chlortribrom- 

 propionic acid. A solution of the acid in chloroform was allowed to 

 stand several days, with somewhat more than the calculated weight of 

 bromine. Chlortribrompropionic acid separated from this solution in 

 large prismatic crystals, which after crystallization from carbonic 

 disulphide melted at about 98°. This acid will be submitted to a 

 more extended study. 



