DIAMERONE MON-UREIDES. 



135 



(142.) Even this table, however, is far from -being complete. 

 Thus I have introduced only one alcoholic urea as a type 

 namely, the methylic, excluding its homologues. I have also 

 omitted uroxanic acid and several amidated and nitro-compounds, 

 to which I shall presently refer. Moreover, between some of 

 the consecutive mon-ureides shown in the table, there exist 

 diameric bodies formed by the union of the two consecutive mon- 

 ureides with elimination of water. Allituric acid, for instance, is a 

 diamerone of hydantoine and lantanuric acid ; while leucoturic 

 acid is a diamerone of lantanuric acid and oxaluric or parabanic 

 acid, thus : 



Allituric Water Hydantoine Lantanuric 



C 6 N 4 H 6 4 + H a O = C 3 N a H 4 O a + C 3 N a H 4 3 . 



Leucoturic Water Lantanuric Parabanic 



C 6 N 4 H 4 5 + H a O = C 3 N a H 4 3 + C 3 N a H a 3 . 



In a precisely similar manner, among mesoxalic compounds we 

 have hydurilic acid, a diamerone of barbituric acid and dialuric 

 acid ; while alloxantine is a diamerone of dialuric acid and 

 alloxanic acid or alloxan, thus : 



Hydurilic Water 



C 8 N 4 H 6 6 + H a O 



Alloxantine Water 



C 8 N 4 H 4 7 



H a O 



Barbituric 

 C 4 N a H 4 3 



Dialuric 

 C 4 N a H 4 4 



Dialuric 

 C 4 N a H 4 4 . 



Alloxan 

 C 4 N a H a 4 , 



(143.) Of the many bodies above formulated, only a few call 

 for any special remark. Hydantoic acid is also known as gly- 

 coluric acid, which is, perhaps, a better name for it. Again, the 

 body here called lantanuric acid is probably identical with the 

 allanturic acid of Pelouze, and also with difluan. Oxaluric 

 acid is interesting from the alleged occurrence of its calcium-salt 

 in human urine, in the form of the dumb-bell crystals so often 

 associated with octahedral crystals of the oxalate. That these dumb- 

 bells may consist of oxalurate of calcium, as suggested by their 

 discoverer, Golding Bird, is not indeed improbable ; but the evi- 



