194 J. W, Mallet— Constitutional formulcB of Urea, etc. 



in which the ureic hjdroxyl is replaced by hydrogen. The 

 production of this acid by hydrogenation of alloxan will be 

 seen presently to be readily intelligible. 



And from dialuric acid is derived the amide, uramile (dialu- 

 ramide), C,H,N303 (No. 1). 



1. Uramile (neutral). 2. Alloxan (neutral). 3. Alloxanic acid (di-basic). 



H— N-H N 6 N C— C— 



C—C— d C— C— 6 0^ 



Hi III i_0-H 



i 



For the production of this body from alloxantine by the action 

 of ammonium chloride, with separation of alloxan and hydro- 

 chloric acid, see the formula given beyond for alloxantine. 



The formula of alloxan, C^HaN^O,, also a mon-ureide, 

 becomes as represented in No. 2, while alloxanic acid, 

 C.H.N^O,, formed by attachment of the urea residue by 

 its opposite extremity, and with assumption of a molecule of 

 water, may be viewed as in No. 3 above. Clans and Emde 

 have noticed the difference of character between the last two sub- 

 stances, and suggested in explanation the following formulae : 



1. Alloxan. 2. Alloxanic acid. 



0— c— I l-c=-o 



one of the few instances in which I find an attempt made to 

 carry out the idea urged in this paper. Gibbs's formulae would 

 imply that both substances were acid, and of the same degree 

 of basicity. The parallelism between alloxan and paraban is 

 seen to be brought out by the mode of representation now sug- 

 gested, and an explanation is afforded of the fact that whereas, 



ox al uric acid does to paraban, the former acid is di-basic and 

 the latter mono-basic only. 



* Ber. d. deutsch. chem. Gesellsch., vii, 226. f Principea de Chimie (1875), u, 5t8. 

 (To be continued.) 



