APPENDIX. 



}8i 



XANTHIN BODIES. 



RELATION OF UREA TO THE CO^ DERIVATIVES 



AND THE CY-COMPOUNDS. 

 0=c{gi 0=C{NH, ._MNH, 



OH 

 OH 

 CSftrbonic Acid. 



Carbamic Acid. Uraft«Carbaimd. 



/NH, 

 C0a+2NH,=C0<( 



\O-NH4 

 Carbamate of Ammonb 



