XXIV.] 



URINARY DEPOSITS, ETC. 



149 



UNORGANISED DEPOSITS. 



A. IN ACID URINE. 



1. Amorphous. 



(a. ) Urates. Soluble when heate'd, 

 redeposited in the cold ; when hydro- 

 chloric acid is added microscopic crys- 

 tals of uric acid are formed = urates. 



(b.) Tribasic Phosphate of Lime. 

 Not dissolved by heat, but disap- 

 pears without effervescence on adding 

 acetic acid. It is probably tribasic 

 phosphate of lime (Ca 3 2P0 4 ). 



(e. ) Oil Globules. Very small 

 highly refractive globules, soluble in 

 ether (very rare). 



2. Crystalline. 



(a. ) Uric Acid. Recognised by the 

 shape and colour of the crystals and 

 their solubility in KHO. 



(b.) Oxalate of Lime. Octahedral 

 crystals, insoluble in acetic acid (fig. 

 76). 



(c.) Cystin( very rare). Hexagonal 

 crystals, soluble in NH 4 HO (fig. 78). 



B. IN ALKALINE URINE. 



i. Amorphous, 

 (a.) Tribasic Phosphate of Lime 



dissolves in acids without efferves- 

 cence. 



(b.) Carbonate of Lime. 



below.) 



(d.) Leucin and Tyrosin (very 

 rare). (Fig. 79.) 



(e.) Cholesterin (very rare). (Fig. 

 40.) 



3. Urinary Calculi. 



They are composed of urinary constituents which form urinary deposits, 

 and may consist of one substance or of several, which are usually deposited in 



2. Crystalline. 



(a.) Triple Phosphate. Shape of 

 the crystals (knife-rest or coffin-lid), 

 soluble in acids. 



(6.) Acid Ammonium Urate. 

 Small dark balls, often covered with 

 spines, and also amorphous granules 

 (ng. 77). 



(c.) Carbonate of Lime. Small 

 colourless balls, often joined to each 

 other ; effervescence on adding acids 

 (microscope). 



(d.) Crystalline Phosphate of 

 L-'me. 



(e.) Leucin and Tyrosin (very rare). 

 (Fig. 79-) 



FlO. 76. Oxalate of Lime. Octa- 

 hedra and Hour-glass forms. 



_ | " -*wr 'i - < 



FiG. 77. Acid Urate of Ammonium. 



layers, in which case the most central part is spoken of as the "nucleus." 

 The nucleus not unfrequently consists of some colloid substance mucus, a 



