128 PROCEEDINGS OF THE AMERICAN ACADEMY. 



the constant melting point 92°, when it was dried in vacuo, and analyzed 

 with the following results : — 



I. 0.2043 gram of the substance gave hy the method of Carius 0.1136 

 gram of argentic bromide. 

 II. 0:2885 gram of the substance gave 20.6 c.c. of nitrogen at a tem- 

 perature of 12° and a pressure of 745 mm. 



Found. 

 I. II. 



23.69 



8.32 



The substance is therefore a bromdinitroresorcine diethylether isomeric 

 with the one obtained by W. H. Warren and one of us * by the action of 

 cold sodic ethylate upon the tribroradinitrobenzol and melting at 184°. 

 As the constitution of this substance has been established (in this paper) 

 as OC2H5l,OC2ll55,Br3,NOo2,NOo4, it follows that our new bromdi- 

 nitroresorcine diethylether must have the constitution 



OC2H6l,OC2H53,Br5,N022,N024, 



as this is the only other body with this composition which can be obtained 

 from this tribromdinitrobenzol. 



Properties of Bromdinitroresorcine Diethylether. Melting Point 92°. 

 C6HBr(OC2H5)2(N02)2. (OC2H,)2l,3,Br5,(NOo)22,4. 



This substance crystallizes in white needles thickly crowded into 

 bunches shaped like hour-glasses ; when better developed, they form 

 prisms with blunt ends, which seem to be made up of a basal plane 

 modified by verv minute planes of a pyramid. On long exposure to the 

 air, especially in bright light, it turns brownish, and this change is ac- 

 companied by decomposition. It melts at 92° ; and is freely soluble even 

 in the cold in benzol, ether, chloroform, acetone, glacial acetic acid, car- 

 bonic disulphide, or acetic ester ; somewhat soluble in cold alcohol, freely 

 in hot; sparingly soluble in cold ligroin, freely in hot; essentially 

 insoluble in water whether cold or hot. Ligroin is the best solvent for 

 it. A hot solution of sodic hydrate has little or no action on it. On 

 heating it with sodic ethylate it is converted almost quantitatively into 

 the triethylether of dinitrophloroglucine formed by the replacement of 

 its atom of bromine by an ethoxy group; the product was recognized 

 by its melting point 105°, and its other properties. The wash waters 



* These Proceedings, XXV. 166. 



