332 



Mr. W. J. Sell and Prof. W. J. Lewis. [Feb. 14, 



The Pier ate. 



The addition of an aqueous solution of picric acid to a solution of 

 any of the salts of the base produces an immediate separation of the 

 picrate in the form of beautiful green-yellow needles. The salt dissolves 

 readily in alcohol, sparingly in benzene and water, and is practically 

 insoluble in chloroform. The compound recrystallised from water 

 has the composition 



(CON 2 H 4 ) 12 Cr 2 (C 6 H2(N0 2 ) 3 0) 6 8H 2 0. 

 The following determinations were made : 



Double Salt of the Chloride with Mercuric Chloride. 



When solutions of the chloride of chromium urea and mercuric 

 chloride are mixed, a beautiful pale-green crystalline precipitate is 

 produced, consisting of micaceous scales. The compound is very 

 sparingly soluble in cold, very moderately in hot water, and insoluble 

 in the usual organic solvents. The crystals are anhydrous, and may 

 be represented by the formula (CON 2 H 4 ) 12 Cr 2 Cl 6 6HgCl 2 . 



The following results were obtained on analysis : 



1. 17738 gram salt ignited with lime gave 0789 gram metallic 



mercury. 



2. 2'542 gram salt ignited with lime gave 1*1339 gram metallic 



mercury. 



3. 0*599 gram salt ignited alone gave 0*0352 gram Cr 2 3 . 



4. 0*9321 0-0553 



Double Salts of Oxalate of the Base with Chromium Oxalate No. 1. 



In attempting to prepare the oxalate of chromium urea from the 

 acetate by the addition of a cold saturated solution of ammonic 



