346 PROCEEDINGS OF THE AMERICAN ACADEMY 



Calcic /38 Dichlorpyromucate, Ca(C 5 HCl. 2 3 ) 2 . 3 H 2 0. — Tlie cal- 

 cium salt was prepared by precipitating a dilute solution of the ammo- 

 nium salt with calcic chloride, and recrystallizing the product from hot 

 water. It is but sparingly soluble in hot water, still less soluble in 

 cold water, and separates from a hot concentrated solution in flattened 

 prisms with rectangular terminations. The crystallized salt is perma- 

 nent in the air, effloresces slowly over sulphuric acid and loses all its 

 water at 125°. 



I. 1.5490 grm. air-dried salt lost at 125° 0.1820 grm. H 2 0. 

 II. 0.4067 grm. air-dried salt gave 0.1219 grm. CaS0 4 . 



Calculated for Found. 



Ca(C 5 HCl,0 3 ) 2 . 3 H 2 0. I. II. 



H,0 11.90 11.75 



Ca 8.81 8.81 



0.6899 grm. salt dried at 125° gave 0.2332 grm. CaS0 4 . 



Calculated for 



Ca(C 6 HCl 2 3 ) 2 . Found. 



Ca 10.00 9.94 



The solubility of the salt in water at 19°. 5 was determined in the 

 usual manner. The calcium was precipitated as oxalate and ignited 

 with sulphuric acid. 



I. 32.1733 grm. solution saturated at 19°. 5 gave 0.0244 grin. CaS0 4 . 

 II. 36.7555 grm. solution saturated at 19°.5 gave 0.0289 grm. CaS0 4 . 



The solution saturated at 19°. 5 therefore contained the following 

 percentages of anhydrous salt : 



I. IT. 



0.22 0.23 



Ethyl /3S Dichlorpyromucate, C 5 HC1 2 3 C 2 H 5 . — The ethyl ether was 

 prepared by the action of ethyl iodide on the silver salt, and is a heavy 

 liquid of pleasant odor. It melts at 2-3° and distils at 116-118° 

 under a pressure of 16 mm., the oil bath being at 165-175°. An 

 analysis of the distilled ether gave the following result. 



0.2157 grm. substance gave 0.2957 grm. AgCl. 



Calculated for Found. 



C 6 HC1 2 3 C 2 H 5 . 



CI 33.98 33.89 



/3S Dichlorpyromucamide, C S HC1 2 2 NH 2 . — The ethyl ether is but 

 slowly attacked by concentrated ammonia in the cold, but at 100° it is 

 readily converted to the amide. The amide is sparingly soluble in 



