APPENDIX. ANALYTICAL EVIDENCE. 



99 



The cystic oxide is distinguished from all the other concretions occurring in the uri- 

 nary bladder 7 by the sulphur it contains. It can be shown with certainty, that the sul- 

 phur is present neither in the oxidized 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 j all 

 of which are substances, the occurrence of which in the body is beyond all doubt 



4 atoms cystic oxide = C^N'H^O^S 8 =4 (CNH 6 4 S 2 ). 



An excellent method of detecting the preserfce of cystic oxide in calculi or gravel is 

 the following : 



The calculus is dissolved in a strong solution of caustic potash, and to the solution is 

 added so much of a solution of acetate of lead, that all the oxide of lead is retained in so- 

 lution. When this mixture is boiled there is formed a black precipitate of sulphuret of 

 lead, which gives to the liquid the aspect of ink. Abundance of ammonia is also disen- 

 gaged ; and the alkaline fluid is found to contain, among other products, oxalic acid. 



NOTE (33,) p. 45. 



COMPOSITION" OP OXALIC, OXALURIC, AND PARABANIC ACIDS. 



1. OXALIC ACID (hydrated.) 



Carbon , 

 Hydrogen 

 Oxygen, 



Carbon 

 Hydrogen 

 Nitrogen 

 Oxvgen 



Carbon 

 Hydrogen 

 Nitrogen 

 Oxygen 



Gay Lussac & Thenard. 



26-566 



. 2-745 



70-689 



Berthollet. 



25-13 

 3-09 



71-78 



2. OXALURIC ACID, a 



Woehler and Liebig.* 



27-600 27-318 



3-122 3-072 



21-218 21-218 



. 48-060 48-392 



a Ann. der Pharm., XXVI., 286. 



3. PARABANIC ACID, a 



Woehler and Liebig.* 



31-940 



. 2-09 1-876 



24-66 24-650 



. 41-30 41-534 



a Ann. de Pharm., XXVI., 286. 



Calculated 

 C2 O3+HO 



26-66 



2-22 



71-12 



Calculated 

 C6H4N2O8 



27-59 



3-00 



21-29 



48-12 



31-91 

 1-73 



24-62 

 4174 



Hence 



NOTE (34,) p. 45. 



COMPOSITION OF ROASTED FLESH. 



(1.) 0-307 of flesh gave 0-584 of carbonic acid and 0-206 of water. 

 (2.) 0-255 do. 0-485 do. 0-181 do. 



3.) 0-179 do. 0340 do. 0-125 do. 



Carbon 



Hydrogen 



Nitrogen 



Oxygen > 



Ashes 



Flesh of roedeer(l.) 

 Bceckmann.* 



52-60 



. 7-45 



15-23 



, 24-72 



Flesh of Beef (2. ) Flesh of Teal (3.) 

 Playfair. 



52-590 



7-886 



15-214 



24.310 



42-52 



7-87 



14-70 



24.91 



