OF ARTS AND SCIENCES. 187 



ethyl compound. The first drop of sodic methylate solution turned 

 red on touching the liquid in the flask, but this color faded to yellow 

 as it was diffused through the solution; with continued addition of the 

 methylate the color increased in intensity, becoming finally blood red. 

 It seemed as if the action of the sodic methylate was more vigorous 

 than that of the ethylate, as after about three quarters of an hour the 

 whole of the tribromtrinitrobenzol had disappeared, leaving a clear 

 red solution, but nevertheless the mixture was allowed to stand over 

 night to make certain that the reaction had come to an end, after 

 which the solvent was evaporated spontaneously, the residue washed 

 with water (which gave a test for sodic nitrite) and crystallized from 

 hot alcohol until it showed the constant melting point 120°, when it 

 was dried at about 70°, and analyzed with the following results : — 



I. 0.2856 gr, of the substance gave 10.1 c.c. of nitrogen at a tem- 

 perature of 25° and a pressure of 755.5 mm. 

 II. 0,2295 gr. of the substance gave by the method of Carius 0.3072 

 gr. of argentic bromide. 

 III. 0.2311 gr. of the substance gave 0.3096 gr. of argentic bromide. 



Calculated for Found. 



CeBrsNOjCCUaO)^. I. II. Ill 



Nitrogen 3.33 3.92 



Bronane 57.15 56.97 57.03 



Properties of Trihromnitroresorcine Dimethylether, CeBr3N0.^(C 1130)2. 

 — This substance crystallizes in white flattened prisms terminated usu- 

 ally by a single plane at a very sharp angle to the sides, rarely by two 

 planes at an obtuse angle to each other, or also rarely the ends are 

 square. It melts at 126°, and is nearly insoluble in cold water, per- 

 haps a little more soluble in hot ; only moderately soluble in ethyl 

 alcohol even when hot, less soluble in it cold. It is much less soluble 

 in alcohol than the corresponding ethyl compound ; in this these two 

 compounds resemble the methyl and ethyl compounds of the bromdi- 

 nitroresorcine. Slightly soluble in cold methyl alcohol, more soluble 

 in hot ; freely soluble in benzol, chloroform, or acetone ; soluble in 

 ether, carbonic disulphide, or glacial acetic acid ; very slightly soluble 

 in ligroiue. The three strong acids have no apparent action on it. 



Action of Sodic Phenolate on Tribromtrinitrobenzol. 



After several unsuccessful experiments we obtained satisfactory 

 results as follows. 10 gr. of tribromtrinitrobenzol were dissolved in 

 a mixture of benzol and ordinary alcohol, and mixed with the sodic 



