300 PROCEEDINGS OF THE AMERICAN ACADEMY 



cause, as has been already stated, these weights were determined 

 with a fair degree of accuracy. 



Alcohol alone (I. and II.) 

 Alcohol and benzol (VI. and VII.) 



The agreement is much closer than we had any right to expect, 

 and shows that the differences in the percentages of bromine are 

 due to absolute variations in the extent of the reaction by which 

 the bromine is removed, since experiments VI. and VII. differ 

 in this respect very widely (VI. 59.54 per cent of bromine, VII. 

 38.91 per cent of bromine); and yet the amount of the trini- 

 trophloroglucine triethylether calculated from these different per- 

 centages of bromine corresponds almost exactly to that obtained 

 experimentally. 



PART II. 



Action of other Alcoholates on Tribromtrinitrobenzol. 



In addition to the work with sodic ethylate just described, we 

 have tried the action of the sodium compounds of other alcohols on 

 the tribromtrinitrobenzol, and give in the first place descriptions 

 of the new confounds thus obtained, followed by a series of quan- 

 titative experiments similar to those tried with the ethylate. 



Sodic Methylate. 



The organic compound insoluble in water obtained by the action 

 of sodic methylate on tribromtrinitrobenzol consisted in every ex- 

 periment we have tried of the tribromnitroresorcine diinethylether, 

 melting at 126°, and already described in our first paper;* as, 

 however, we found that a considerable amount of sodic bromide 

 was formed in these experiments, we turned our attention to the 

 aqueous washings of this organic matter, in which it was evident 

 that the product formed by the removal of the bromine was to be 

 sought. Upon acidifying this aqueous solution with dilute sul- 

 phuric acid, a copious precipitate was obtained, which was only 

 slightly soluble in water, and was purified by crystallization with 

 the following precautions. The substance was dissolved in as small 



* These Proceedings, XXV. 186. 



