184 



URINE. 



2. 4-sided tables or 6-sided rhombic plates 

 often appearing grouped in bunches of 

 spindle-shaped crystals : uric acid ; confirm by 

 the murexide test. 



3. Regular 6-sided tables soluble in hydro- 

 chloric acid and ammonia, which char on 

 heating. Boil with caustic soda containing 

 a drop of very dilute acetate of lead ; a black 

 precipitate of sulphide of lead confirms the 

 presence of cystine. 



4. Wedge-shaped prismatic crystals, some 

 separate, some united, to form a cross : cal- 

 cium phosphate. 



5. Greenish-brown grains with a radiating crys- 

 talline structure : tyrosine. 



6. Needles or rhombic prisms easily soluble on 

 warming : hippuric acid. 



III. The sediment contains organised bodies. 



1. Twisted fringy bundles, forming points, 

 grains, &c. : mucus. 



2. Contracted granular bodies, often united into 

 a scale pavement-like mass : mucus cor- 

 puscles. 



3. Circular biconcave disks, mostly yellowish, 

 which swell up and more or less completely 

 dissolve in acetic acid : blood-corpuscles ; 

 confirm by spectroscopic reactions. 



4. Round, pale, faintly-granular vesicles, of dif- 

 ferent sizes, which swell up considerably in 

 acetic acid, lose their outward granular sur- 



