OP ARTS AND SCIENCES. 265 



II. 0.2027 grm. of the substance gave 0.1577 grm. AgBr. 

 III. 0.2238 grm. of the substance gave 0.1739 grm. AgBr. 



in. 



33.07 



Phenoxybromacrylic acid crystallizes from hot water in long silky 

 needles, which melt at 138°. It is almost insoluble in cold water, 

 and is somewhat sparingly soluble even in boiling water. In ether or 

 alcohol it is very soluble ; in chloroform or benzol it dissolves on 

 warming, and crystallizes as these solutions cool. Carbonic disulphide 

 dissolves it with more difficulty. 



Potassic Phenoxyhromacrylafe. KC3H(0CgH.) BrOg. On cooling 

 the hot solution of potassic mucophenoxybromate in potassic hydrate, 

 potassic phenoxybromacrylate separates in well-formed rhombic. 

 plates, which may be recrystallized from hot water, although they 

 are quite soluble even in cold water. The air-dried salt proved to be 

 anhydrous. 



I. 0.5073 grm. of the air-dried salt gave on ignition with IIjjSO^ 



0.1588 grm. K^^O,. 



II. 0.5077' grm. of the air-dried salt gave on ignition with H^SO^ 



0.1572 grm. K^SO,. 



Calculated for Found. 



KC3H(0C„H5)Br02. I. II. 



K 13.91 14.06 13.90 



Baric Phenoxybromacrylate. Ba(aH(OC„H.)Br02)2.5H20. On 

 neutralizing a boiling solution of the acid with baric carbonate, and 

 evaporating on the water-bath, the barium salt was obtained in the 

 form of radiating prisms, which were permanent in the air and hardly 

 lost in weight over sulphuric acid. It was freely soluble in cold 

 water. The air-dried salt gave on analysis : — 



I. 1.2120 grm. of the air-dried salt lost at 110° 0.1535 grm. Iip. 



II. 1.0468 grm. of the air-dried salt lost at 110° 0.1345 grm. H.,0. 



III. 0.6687 grm. of the air-dried salt lost at 110° 0.0855 grm. HjO. 



