OP ARTS AND SCIENCES. 177 



glacial acetic acid, or acetone ; and this view is confirmed by the be- 

 havior of the auilido compound on crystallization described above. 

 Another determination of the nature of the substance melting at 

 237°-238° will be given below, when we describe its conversion into 

 dinitroresorcine dimethylether. The fact that in the action described 

 above only the bromine was replaced by the aniline radical C^II^NH 

 surprised us, as we had expected that the methoxy groups would 

 undergo a similar replacement owing to their position in regai'd to 

 the nitro groups. 



Properties of Anilidodinitroresorcine Dimethylether, 

 C,H(C«H,NII)(CH,0)3(N0,),. 



This substance forms bright yellow needles, or very slender prisms, 

 which show some tendency to unite in radiating groups. It melts at 

 19G°, and is nearly but not quite insoluble in water; not very soluble 

 in cold ethyl or methyl alcohol, more soluble in hot; freely soluble 

 in chloroform or acetone; soluble in benzol or glacial acetic acid; 

 slightly in ether; very slightly in carbonic disulphide, and insoluble 

 in ligroine. Alcohol is the best solvent for it. 



Properties of Bromdiniiroresorcine Dimethylether, 

 CeHBr(CH,0)2(N0,),. 



Although we did not succeed in getting this substance absolutely 

 pure, we think it worth while to give its properties, as the slight 

 amount of impurity present could have influenced them but little, 

 and they differ rather strikingly from those of the corresponding 

 ethyl compound. When crystallized from glacial acetic acid by 

 cooling, it forms prisms terminated by a single rhombic plane at an 

 acute angle to the sides of the prism, which are so short that the 

 crystal looks almost like a rhombohedron ; these crystals are white 

 with a faint yellowish tinge, and often a millimeter long. When 

 crystallized by slow evaporation of the glacial acetic acid solution 

 the crystals are converted into long well formed prisms, and the 

 single rhombic plane which forms the principal termination is usually 

 modified by other smaller planes. The highest melting point which 

 we have obtained for this substance was 237°-238°, but the analyses 

 showed that even when melting at this point it was still far from 

 pure. It is nearly insoluble in water, its solubility being perhaps 

 somewhat increased by boiling ; very slightly soluble in ethyl or 

 methyl alcohol, the solubility somewhat increased by heat; slightly 

 soluble in acetone, benzol, chloroform, glacial acetic acid, or nitro- 



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