URINARY CRYSTALS 



341 



Chloroform does not answer for sediments as it does for urine to be examined 

 chemically. To take up a sediment insert a pipette to the bottom of the tube with 

 the opposite opening closed by a finger, then tease the sediment into the pipette 

 opening in the centrifuge tube, by manipulating the fingers. 



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k r ^l^K **_**& <S3/ ^ \ 



- e 





FIG. 101. Deposit in acid fermentation, a, Fungus; b, amorphous sodium urate; 

 c, uric acid; d, calcium oxalate. 



In a urine of acid reaction we may find the following unorganized sediment: 

 I. Amorphous sodium or potassium urates. Usually yellowish red. Heat and 

 alkali bring about solution. 



-i, 



FIG. 102. Deposit in ammoniacal fermentation, a, Acid ammonium urate; b, 

 ammonium magnesium phosphate; c, bacteria. 



II. Uric acid. Whetstone crystals of yellowish-red color. Soluble in alkalis 

 but not by heat. Abundant sediment of uric acid crystals may be due to too great 

 concentration or too great acidity of the urine rather than to the so-called uric acid 

 diathesis. 



