320 



APPENDIX. 



6. Uric or Xanthic Oxide, a 



Wuhler aud Liebig.* Calculated C5 H2 N2 O:. 



Carbon 39-28 39-86 



Hydrogen 2-95 2*60 



Nitrogen 36'35 37*72 



Oxygen 21*24 20*82 



a Ann. der Pharm., XXVI., 344. 



7. Cystic Oxide, a 



Thaulow.* Calculated Ce He NO4 S2. 



Carbon 30*01 30*31 



Hydrogen 5*10 4*94 



Nitrogen 11-00 11-70 



Oxygen 28*38 26*47 



Sulphur 25-51 26*58 



a Ann. der Pharm. XXVII., 200. 



The cystic oxide is distinguished from all the other 

 concretions occurring in the urinary bladder by the sul- 

 phur it contains. It can be shewn with certainty, that 

 the sulphur is present neither in the oxidised state, nor in 

 combination with cyanogen ; and in regard to its origin 

 the remark is not without interest, that four atoms of 

 cystic oxide contain the elements of uric acid, benzoic 

 acid, sulphuretted hydrogen, and water ; all of which are 

 substances, the occurrence of which in the body is beyond 

 all doubt. 



1 atom uric acid . . . C10N4 H4 Og 

 1 atom benzoic acid C^ H5 O3 

 8 atoms sulphuret-") 

 ted hydrogen ...J 

 7 atoms water ^7^)7 



4 atoms cystic oxide =; C:,4N4 H24O16SS =r 4 (C6NH6O4S2), 



