264 PROCEEDINGS OP THE AMERICAN ACADEMY 



11. 0.4430 grm. of the salt gave on iguition with H.,SO^ 0.1255 grm. 

 K,SO,. 



Calculated for Found. 



KCjIItOCcIIjlBrOj. I. II. 



K 12.65 12.76 12.72 



Baric Mucophenoxrjbromnte. Ba(CJI(OC,.II,) BrO,)._,3II,0. This 

 salt was obtained by neutralizing a cold u(nieous solution of the acid 

 with baric carbonate, and allowing the solution thus obtained to evapo- 

 rate spontaneously. It separated in leafy rhombic crystals, wiiich were 

 very soluble in water. On warming the solution decomposition en- 

 sued. The air-dried salt contained three molecules of water, one of 

 which it lost over sulphuric acid, the rest at 100^ 



I. 0.8147 grm. of the air-dried salt lost over II.^SO^ 0.0213 grm. 11,0, 

 and in addition 0.0403 grm. at 100^. 

 II. 0.7863 grm. of the air-dried salt lost over H^SO^ 0.0201 grm. HgO, 

 and in addition 00397 grm. at 100°. 



Calculated for Found. 



BalCiUlOCeUjlUrOsJ^SUjO. I. II. 



H^O 2.46 2.61 2.56 



3 HgO 7.39 7.56 7.61 



0.4628 grm. of the salt dried at 100° gave on ignition with H2SO4 

 0.1599 grm. BaSO^. 



Calculated for ' 



Ba(C4H(0CaU5)Br03),. Found. 



Ba 20.23 20.32 



When treated with an excess of an alkaline hydrate, mucophenoxy- 

 bromic acid, like mucobromic, is decomposed, and yields a substituted 

 acrylic acid togetlier with formic acid. 



Phenoxybromacrylic Acid. 



We have found it most convenient to dissolve equal weights of 

 potassic hydrate and potassic mucophenoxybromate each in their own 

 weiglit of water, and to mix the hot solutions. On cooling, potassic 

 phenoxybromacrylate separates in well-formed crystals. From these, 

 by the addition of hydrochloric acid, we pi-epared the acid which, 

 when recrystallized from hot water and dried over sulphuric acid, gave 

 the following results : — 



I. 0.2037 grm. of the substance gave on combustion 0.3307 grm. CO.^ 

 and 0.0553 grm. 11,0. 



