290 PROCEEDINGS OP THE AMERICAN ACADEMY 



Fouad. 

 I. IL 



76.67 



11.55 

 .69 



The salts of this acid are comparatively unstable. We were unable 

 to prepare a silver salt in a form suitable for analysis, since argentic 

 bromide began to separate as soon as argentic nitrate came in contact 

 with the acid. Although there was no perceptible decomposition of 

 the acid when it was treated in the cold with baric carbonate, several 

 different preparations of the salt proved on analysis to contain a quan- 

 tity of barium nearly three per cent in excess of the calculated value. 

 In the preparation of the calcium and potassium salts we found less 

 difficulty. 



Calcic ^-Dibromdichlorpropionate, Ca(C.3Cl2Br202H) . 1^ H2O. — On 

 treating the acid with calcic carbonate and calcic hydrate in the cold, 

 filtering, and concentrating by spontaneous evaporation at the ordinary 

 temperature, the calcium salt separated in clumps of needles. After 

 drying to a constant weight in the air the salt lost one and a half mole- 

 cules of crystal water at 80''. 



I. 0.7775 grm. of the air-dried salt lost 0.0307 grra. II^O at 80°, 

 II. 0.9392 grm. of the anhydrous salt lost 0.0403 grm. H.p at 80°. 

 III. 0.8626 grm. of the anhydrous salt gave 0.1796 grm. CaSO^. 



Calculated for Found. 



Ca(C3nCl2Br„0.,)2 • 1 i n20. I . II. 



H.p 4.05 3.95 4.29 



Calculated for Ca(C3HCl2Bro0j)j. 



Ca 6.25 ' " 6.13 



Potassic fi-Dibromdichlorpropionate, K(C3HCl,Br202)2' 2 II2O. — 

 The potassium salt was made by neutralizing the acid with an aqueous 

 solution of potassic carbonate and allowing it to evaporate without the 

 application of heat. The air-dried salt contained two molecules of 

 crystal water, which it lost over sulphuric acid. 



I. 0.8735 grm. of the air-dried salt lost 0.0809 grm. II.O over II.SO^. 

 II. 0.7933 grm. of the anhydrous salt gave 0.2171 grm. KgSO^. 



Found. 



9.26 



12.28 



