SAWYER. — MUCOPHENOXYCHLORIC ACID. 247 



I. 0.3G40 gram salt dried between filter papers gave, on ignition 

 with H.,S0 4 , 0.1346 gram BaS0 4 . 

 II. 0.7799 gram salt dried between filter papers lost, at 110°, 0.1140 



I. 0.1382 gram salt dried at 110° gave, on ignition with H 2 S0 4 , 

 0.6076 gram BaS0 4 . 

 II. 0.1535 gram salt dried at 110° gave, on ignition with H 2 S0 4 , 

 0.6754 gram BaS0 4 . 



Calculated for Found. 



Ba[C 3 H(0C,iII 5 )C10. 2 ] 2 . I II. 



Barium 25.75 25.85 25.87 



Argentic Phenoxychloracrylate, AgC 3 H(OC 6 H 5 )C102. 



On adding argentic nitrate to a hot aqueous solution of amnionic 

 phenoxychloracrylate, there is precipitated crystalline argentic phenox- 

 ychloracrylate, which may be recrystallized from hot water in beau- 

 tiful feathery needles. Dried over sulphuric acid it gave the following 

 results : — 



I. 0.1759 gram salt gave 0.0821 gram AgCl. 

 II. 0.1165 gram salt gave 0.0547 gram AgCl. 



Calculated for Found. 



AgC 3 H(0C 6 H 5 )C10 2 . I. II. 



Silver 35.35 35.13 35.34 



Phenoxychlormaleic Acid. 



The structure of mucophenoxychloric acid has been further charac- 

 terized by its oxidation to phenoxychlormaleic acid. 



When a solution of mucophenoxychloric acid is heated with argentic 

 oxide, there is deposition of metallic silver, and formation of argentic 

 phenoxychlormaleate, which crystallizes from the hot filtered solution 

 in minute stellate clusters. If the silver be precipitated with hydro- 

 chloric acid, and the filtered solution strongly concentrated, we obtain, 

 on cooling, fine needles of phenoxychlormaleic acid. It has, however, 

 been found advisable, on account of the sparing solubility of the silver 

 salt, to prepare the acid in another way. 



Hill and Cornelison found that mucophenoxybromic acid might 

 advantageously be converted to phenoxvbrommaleic acid by boiling 



