OF ARTS AND SCIENX'ES. 181 



and deposited some crystals, apparently tribromdiuitrobenzol, but the 

 action was very limited, if any had taken place. Accordingly the 

 mixture was heated on the steam bath in a flask with a return 

 condenser for ten to twelve hours, when it turned dark brown, and 

 after the solvent had been distilled off there was left in the flask a 

 brownish viscous residue of the most uninviting appearance. This 

 was thoroughly washed with water, and then allowed to stand for sev- 

 eral days, which rendered it more solid ; it was then washed three or 

 four times with small quantities of cold alcohol, which removed much 

 but not by any means all of the oily impurity, and the still viscous 

 residue recrystallized from a mixture of alcohol and benzol until it 

 showed the constant melting point 165°, when it was dried at 100°, 

 and analyzed with the following results : — 



I. 0.3128 gr. of the substance gave on combustion 0.5781 gr. of car- 

 bonic dioxide and 0.0790 gr. of water. 

 II. 0.2051 gr. of the substance gave according to the method of 

 Carius 0.0888 gr. of argentic bromide. 



Found. 



II. 



18.43 



These results prove that the substance is the bromdinitroresorcine 

 diphenylether. We may add, that in one preparation in addition to 

 this a substance was obtained crystallizing in square plates and melting 

 at about 158°, but in too small quantity for analysis, and we have not 

 succeeded in making it again. We can say nothing about the nature of 

 the oily product of the reaction, as we could find no way of purifying it. 



Properties of Bromdinitroresorcine Diphenylether, 

 C,HBr(CJI,0),(NO,),. 



This substance forms woolly masses of irregularly radiating needles 

 which under the microscope appear long and rather slender, with 

 either a rounded sharpening at the point or else very sharp tapering 

 ends ; the substance is white at first, but turns to a pale chocolate- 

 brown on exposure to the air. It melts at 1G5°, and is very slightly 

 soluble in water whether cold or hot ; slightly soluble in cold alcohol, 

 more soluble in hot but not freely ; rather more soluble in methyl 

 than in ethyl alcohol, but not freely soluble even in this when hot; 

 very freely soluble in chloroform; freely in benzol or acetone; soluble 



