320 URINE. [CH, XII. 



In alkaline urine. 



Ammonium magnesium phosphate (triple phosphate) : 

 colourless prisms ("coffin-lids" and "knife-rests") or 

 feathery stars. Easily soluble in acetic acid. 



Alkaline earthy phosphates of calcium and magnesium : 

 amorphous. Insoluble on warming and in alkalies, soluble 

 in acetic acid. 



Calcium hydrogen phosphate : see above. 



Calcium carbonate : dumb-bells or spheres with radiat- 

 ing structure. 



Ammonium urate : yellow, or brownish amorphous 

 masses, or shewing "thorn-apple" crystals. Soluble on 

 warming. 



