1889.] On Salts of a Base containing Chromium and Urea. 329 



tate, recrystallised from warm water, separates in bright green 

 prismatic crystals containing 6 mols. of water of crystallisation. The 

 salt is tolerably soluble in cold, freely in hot water, insoluble in strong 

 solutions of alkaline bromides, and in the usual organic menstrua. 

 It has the composition {(CON 2 H 4 ) 12 Cr 2 }Br 6 6H 2 0. The following 

 results were obtained on analysis : 



1. 1*403 gram lost in vacua 0*108 gram, and no further loss was 



sustained at 101 C. 



2. 1" 185 15 gram dissolved in water, the Or separated by boiling for 



some time with precipitated chalk, and after nitration the 

 nitrate made up to 250 c.c. Mean of four concordant titra- 

 tions with AgNO 3 required 10*17 c.c. ; each c.c. AgNO 3 = 

 0*0035293 01. 



Dark-green crystals, in which the/{311} planes were most promi- 

 nently developed. The planes s{lll} and &{10l} were about equally 

 developed; and the planes &{2ll} and r{100} were all small, and 

 these latter did not seem to be present on all the crystals. The habit 

 of the crystal rendered it a little puzzling to decipher the symmetry 

 by inspection. 



