OF ARTS AND SCIENCES. 189 



in water, whether cold or hot ; sliglitly soluble in cold alcohol, more 

 soluble in hot, but not freely ; its solubility in methyl alcohol is simi- 

 lar to that in ethyl alcohol ; very freely soluble in acetone or chloro- 

 form ; freely soluble in benzol or glacial acetic acid ; slightly soluble 

 in ether or carbonic disulphide; very slightly soluble in ligroine. 

 The three strong acids have no apparent action on it, whether hot or 

 cold. 



This is the only case in which we have observed the replacement of 

 all three of the atoms of bromine by the radical of an alcoholate, and 

 it is to be noted that the phenoxy radical introduced here is the most 

 acid one which we have succeeded in introducing, whereas in the other 

 cases where all the bromine has been replaced by the same radical 

 this has been the alkaline amido or anilido group, — 



Ce(NH2)3(NO,)3, * C,(NHCeH,)3(N0,)c, t C,H(NH,)3(N0,),, t 

 C«H(NHCeH,)3(N0,),.§ 



Experin\ents with Sodt'c Acetate, Sodic Picrate, or Sodic Nitromethane 

 on Tribromdinilrohenzol or Tribromtrinitrohenzol. 



In order to study the action of more acid radicals upon tribrom- 

 dinitrobenzol we mixed 5 gr. of it with 3 gr. of sodic acetate dis- 

 solved in dilute alcohol, and, as there seemed to be no action in the 

 cold, heated the mixture in a flask with a return condenser on the 

 steam bath for eight hours, at the end of which time the tribromdini- 

 trobenzol was recovered unaltered as indicated by its melting point, 

 192°. A similar mixture was next heated to 100° for two days in a 

 soda-water bottle closed with an india-rubber stopper, at the end of 

 which time 4.9 gr. of tribromdiuitrobenzol melting at 192° were re- 

 covered. It is evident from these experiments that sodic acetate has 

 no action on tribromdiuitrobenzol at 100'. 



As we hoped that the slighter acidity of picric acid might allow it 

 to react on tribromdiuitrobenzol, although sodic acetate would not, 

 we next allowed 6.3 gr. of tribromdinitrobenzol to stand for a week 

 with 12 gr. of sodic picrate suspended in alcohol, and, as at the end 

 of this time no sodic bromide had been formed, we heated it in a flask 

 with a return condenser on the steam bath for two days, but even 

 after this no sodic bromide could be detected, and 6.2 gr. of tribrom- 

 dinitrobenzol melting at 192° were recovered in place of the 6.3 gr. 



* These Proceedings, xxiii. 142. J Ibid., xxiv. 106. 



t Ibid., 145. § Ibid., 111. 



