TJEINE. 181 



4. Take 1 c.c. of urine, dilute it with 4 to 5 

 c. c. of water, add ^ a c. c. of caustic soda, 

 and one drop of a very dilute solution of 

 copper sulphate ; boil ; a red granular pre- 

 cipitate of suboxyde of copper indicates the 

 presence of sugar. 



5. Immerse in the urine a piece of filter- 

 paper moistened with acetate of lead solu- 

 tion, if the lead paper turns brown or black 

 sulphuretted hydrogen is present. 



6. Evaporate 40 to 50 c. c. of the urine to 

 dryness, ignite the residue at a moderate 

 heat till all the charcoal has been burnt 

 off; boil the residue with water and filter. 



a. 1. Acidify a portion of the filtrate 

 with hydrochloric acid ; add baryum 

 chloride; a white precipitate proves the 

 presence of sulphuric acid. 



2. Acidify a second portion with nitric 

 acid, add a drop of silver nitrate ; a white 

 curdy precipitate indicates hydrochloric 

 acid. 



3. Acidify a third portion with acetic 

 acid, add a little ferric chloride solution, a 

 yellowish-white, gelatinous precipitate in- 

 dicates phosphoric acid. 



4. Evaporate the rest to dryness ; take 

 up a small portion on the end of a platinum 

 wire and expose in a Bunsen or spirit lamp 



