OF ARTS AND SCIENCES. 337 



substance soon separates, wliich becomes somewhat discolored on drying. 

 It is sparingly soluble in cold water, readily soluble in alcohol, but 

 insoluble in ether. It is decomposed in the cold by dilute hydrochloric 

 acid, or by a dilute solution of sodic carbonate, with the formation of 

 phenylhydrazine. This behavior shows that it is simply a salt of 

 phenylhydrazine rather than a characteristic condensation product. 

 The substance was well washed with cold water, and dried over sul- 

 phuric acid. 



I. 0.3000 grm. substance gave 0.1189 grm. AgCl. 

 II. 0.3218 grm. substance gave 34 cc. of moist nitrogen at 18° and 

 under a pressure of 748 mm. 

 III. 0.2248 grm. substance gave 23.5 cc. moist nitrogen at 20° and 

 under a pressure of 741 mm. 



in. 



11.87 



Theoketical Considerations. 



Although the facts which we have observed are in certain respects 

 difficult of interpretation, it seems to us that, on the whole, they war- 

 rant tolerably definite conclusions as to the constitution of mucoxybro- 

 mic and mucoxychloric acids. We may safely assume that mucobromic 

 and mucochloric acids are to be represented by the formulce,* 



I I 

 CBr CCl 



II II 

 CBr CCl 



I I 



COOH COOH , 



It is evident that the carboxyl group is not affected by the reaction 

 in question, and, furthermore, that the aldehyde group is also still con- 

 tained in the mucoxybromic and mucoxychloric acids. The latter foct 

 is sufficiently proved by the behavior of the two acids with argentic 

 nitrate, by the ready formation of condensation products with aniline, 

 and, lastly, by the appearance of substituted aldehydes among the 



* These Proceedings, Vol. XVI. p. 218 ; Vol. XVII p. 150. 



VOL. XXII. (N. S. XIV.) 22 



