OF ARTS AND SCIENCES. 341 



The aniline derivatives are then strictly analogous to the anil- 

 glyoxylic acid of Bdttinger.* 



pH pH pH 



I I I 

 CBr CCl COOH. 



II II 



C— OH C-OH 



I I 



COOH COOH 



That the dibasic character of these compounds has been impaired by 

 the introduction of the aniline residue is but natural, while the per- 

 sistence of this dibasic character shovps that they cannot be derived 

 from the ketone formula by the replacement of the ketone oxygen. A 

 compound of the form 



^O 



I 



^H 



I 

 C = N . CgH^ 



COOH 



could hardly form dibasic salts. 



Moreover, the fact that these aniline derivatives do not form stable 

 condensation products with phenylhydrazine may be taken as further 

 evidence that they contain hydroxyl, and not the ketone or aldehyde 

 group. That we have not yet been able to reverse the reaction, and 

 replace the hydroxyl groups again by the halogens, we cannot but 

 think due simply to the instability of the acids themselves. 



While we feel that the constitution of mucoxybromic and mucoxy- 

 chloric acids is thus determined with reasonable certainty, further in- 

 vestigations upon the subject will be made in this laboratory. 



* Ann. Chera. u. Pharm., cxcviii. 222. 



