APPENDIX. 



XANTHIN BODIES. 



RELATION OF UREA TO THE C0 2 DERIVATIVES 

 AND THE CY-COMPOUNDS. 



0=c 



(OH 

 i OH 



Carbonic Acid. 



_ p (NH 2 



- G 10H 



Carbamic Acid. 



n _ r , 

 - C 



NH 2 



NH 2 

 Urea=Carbamid. 



yNH 2 

 <( 

 \0- 



-NH 4 



Carbaiuate of Ammonia. 



