248 PROCEEDINGS OP THE AMERICAN ACADEMY. 



the aqueous solution of its oxime ; * and the same procedure has here 

 been followed for the oxidation of mucophenoxychloric acid. Muco- 

 phenoxychloroxime is boiled with about twenty times its weight of 

 water, until nothing separates on cooling. This solution is acidified 

 with hydrochloric acid and extracted with ether, and the phenoxy- 

 chlormaleic acid is removed from its ethereal solution by sodic car- 

 bonate, from which, in turn, it is separated by a second acidification 

 and extraction ; the ether is allowed to evaporate, and the crystalline 

 residue is purified by sublimation in a current of carbonic dioxide. 

 The anhydride thus obtained is dissolved in a small quantity of water, 

 which, on spontaneous evaporation, deposits the acid as a mass of 

 interlacing needles. 



When thoroughly dried by pressure between filter papers, these 

 crystals lose no weight in the air; but over sulphuric acid they suffer 

 a gradual loss equivalent to one molecule of crystal water. 



I. 0.2948 gram air-dried substance lost over H 2 S0 4 , 0.0195 gram 

 H 2 0. 

 II. 0.2769 gram air-dried substance gave on combustion 0.0860 gram 

 H,0 and 0.4660 gram C0 2 . 

 III. 0.1810 gram air-dried substance gave 0.0995 gram AgCl. 



Calculated for Found. 



C 4 H 2 (0C 6 U 5 )C10 4 . H,0. I. II. in. 



Water 6.91 6.62 



Carbon 46.06 45.90 



Hydrogen 3.46 3.45 



o v 



Chlorine 13.62 13.60 



0.1652 gram substance dried over H.,S0 4 gave 0.0960 gram AgCl. 



Calculated for . 



C 4 H 2 (OC li H 3 )C10 1 . Found. 



Chlorine 14.64 14.38 



The acid containing water of crystallization has no definite melting 

 point, while that dried over sulphuric acid melts at 115°-122°, accord- 

 ing to the mode of heating. It dissolves readily in water, alcohol, 

 ether, chloroform, and benzol, is somewhat less soluble in ligroin, and 

 only sparingly in carbonic disulphide. From hot benzol or ligroin it 

 crystallizes in minute needles. 



The identity of acids prepared by the two methods already described 

 has been determined, in the absence of a definite melting point, by the 

 identity of their anhydrides. 



* These Proceedings, ante, p. 53. 



