OP ARTS AND SCIENCES. 333 



0.5160 grm. of the salt dried at 105° gave 0.2111 grm. CaS0 4 . 



Calculated for 

 Ca(C 5 H 2 C10 3 ) 3 . Found. 



Ca 12.09 12.03 



The pointed prisms obtained by evaporating the solution at 100° 

 gave the following results. 



0.4433 grm. of the air-dried salt gave 0.1796 grm. CaSO r 



Calculated for 



Cu(,C 5 II,C10 3 ) ? . Found. 



Ca 12.09 11.92 



The solubility of the calcium salt in cold water was determined in 

 the usual manner. The calcium was precipitated as oxalate, and con- 

 verted into the sulphate before weighing. 



I. 5.0960 grm. solution saturated at 19°. 5 gave 0.0653 grm. CaS0 4 . 

 II. 5.8981 grm. solution saturated at 19°. 5 gave 0.0752 grm. CaS0 4 . 



According to these determinations, the aqueous solution saturated at 

 19°.5 contained the following percentages of the anhydrous salt: — 



i. ii. 



3.12 3.10 



Ethyl (3 Chlorpyromucate, C.H 2 C10 3 . C 2 H 5 . — The ethyl ether was 

 prepared by heating at 100° for four hours a mixture of 2 parts of the 

 acid. 3 parts of absolute alcohol, and 2 parts of sulphuric acid (Sp.Gr. 

 1.84). On dilution with water the ether separated as an oil, which 

 was thoroughly washed and dried over calcic chloride. It then dis- 

 tilled without essential decomposition at 217° (mercury column com- 

 pletely in vapor) under a pressure of 764 mm. The liquid distillate 

 solidified on cooling, with the formation of concentrically grouped 

 prisms, which, after repeated recrystallization by cooling the melted 

 ether, showed the constant melting point of 29-30°. 



0.1864 grm. of substance gave 0.1523 grm. AgCl. 



Calculated for 

 C 6 H 2 C10 3 . C 2 H 6 . Found. 



CI 20.34 20.19 



Action of Nitric Acid. 



/3 chlorpyromucic acid is readily attacked by dilute nitric acid, but 

 the oxidation is not smoothly effected, and the yield of chlorfumaric 

 acid is comparatively small. The best results were obtained when the 

 acid was boiled with 2 parts of nitric acid (Sp. Gr. 1.42) diluted with 



