180 



URINE. 



2. The insoluble residue consists of mucus 

 and uric acid. Wash off the filter into a 

 test tube, add one or two drops of caustic 

 soda, warm and filter. The insoluble resi- 

 due is mucus. The filtrate contains uric 

 acid and hydrochloric acid ; the Uric acid 

 separates out in crystals ; collect and 

 examine under the microscope, also verify 

 by applying the murexide test, the presence 

 of uric acid. 



3. The urine is brown or green ; froths on 

 shaking ; colours a small piece of immersed 

 filter-paper yellow or green; probable 

 presence of bile matter. 



Place some of the urine upon a white 

 plate and drop in a little strong nitric acid 

 containing some nitrous, without shaking. 

 The fluid turns successively green, blue, 

 violet, and brown ; presence of a derivate 

 of colouring matter of the bile. 



To a second portion add some lead 

 acetate in solution ; collect the precipitate, 

 wash, dry, and boil the dried precipitate 

 with alcohol, to which a little sulphuric 

 acid has been added, filter ; the filtrate is 

 green from biliprasine. 



Evaporate a third portion of 3 to 500 c.c. 

 on the water-bath, extract with alcohol; 

 search for biliary acids, tauro- and glyko- 

 cholic. 



