OP ARTS AND SCIENCES. 339 



Argentic fty Dichlorpyromucate, AgC 5 HCl 2 3 . — If argentic nitrate 

 is added to a cold aqueous solution of the acid, the silver salt is pre- 

 cipitated in the form of fine needles. For analysis 'we prepared the 

 salt by precipitating a dilute neutral solution of the ammonium salt 

 with argentic nitrate, and recrystallizing the precipitated salt from 

 hot water. It is sparingly soluble even in hot water, and separates on 

 cooling the hot saturated solution in fine needles. 



I. 0.3230 grm. substance dried over H 2 S0 4 gave 0.1612 grm. Ao-Cl. 

 II. 0.2580 grm. substance dried over H 2 S0 4 gave 0.1282 grm. AgCl. 



Calculated for Found. 



AgC 5 HCl 2 O s . I. II. 



Ag 37.50 37.57 37.41 



Ethyl /3y Dichlorpyromucate, C 5 IIC1 2 3 C 2 H 5 . — The ethyl ether was 

 prepared by heating at 100° for three hours a mixture of 5 parts of 

 acid, 8 parts of absolute alcohol, and 5 parts of concentrated sulphuric 

 acid (Sp. Gr. 1.84). It was precipitated with water, washed with 

 dilute sodic carbonate, and then with water. It is readily soluble in 

 hot alcohol, more sparingly in cold, and crystallizes in large needles 

 which melt at 63-64°. 



I. 0.2645 grm. substance dried over H 2 S0 4 gave 0.3640 grm. AgCl. 

 II. 0.1933 grm. substance dried over H 2 S0 4 gave 0.2673 grm. AgCl. 



Calculated for Found. 



CfiHCljO^Hs. I. II. 



CI 33.98" 34.02 34.18 



fiy Dichlorpyrmucamide, C 5 HC1 2 2 NII 2 . — The ethyl ether of /?y 

 dichlorpyromucic acid is readily attacked by strong aqueous ammonia 

 even in the cold, and in a short time is converted into the amide. 

 The amide is sparingly soluble even in hot water, and crystallizes in 

 long slender needles which melt at 176-177°. 



0.4015 grm. substance dried over II 2 S0 4 gave 28.5 c.c. moist N 

 at 23° under a pressure of 767 mm. 



Calculated for 



C 3 nCU0 2 NII 2 . Fcund. 



N 778 8.03 



The formation of but one dichlorpyromucic acid in the decomposi- 

 tion of the ethyl pyromucic tetrachloride by alkalies, while two iso- 

 meric acids are always obtained under the same circumstances from 

 the corresponding bromine compound, made it impossible to predict its 

 constitution from the method of formation. Still, its comparatively 

 high melting point, its physical properties, and the ready solubility of 



