XXIV.] 



URINARY DEPOSITS, ETC. 



149 



UNORGANISED DEPOSITS. 

 A. IN ACID I^EINE. B. IN ALKALINE URINE. 



1. Amorphous. 



(a. ) Urates. Soluble when heated, 

 redeposited in the cold ; when hydro- 

 chloric acid is added microscopic crys- 

 tals of uric acid are formed = urates. 



(6.) 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 ). 



(c. ) 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. " 



(6.) Oxalate of Lime. Octahedral 

 crystals, insoluble in acetic acid (fig. 

 76). 



(c.) Cystin (very rare). Hexagonal 

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



(d.) Leucin and 

 rare). (Fig. 79.) 



(e.) Cholesterin (very rare). 

 40.) 



Tyrosin (very 

 (Fig. 



I. Amorphous. 



(a.) Tribasic Phosphate of Lime 

 dissolves in acids without efferves- 



cence. 



(b.) Carbonate of Lime, 

 below.) 



(See (ft) 



2. Crystalline. 



(a.) Triple Phosphate. Shape oi 

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

 soluble in acids. 



(b. ) Acid Ammonium Urate. 

 Small dark balls, often covered with 

 spines, and also amorphous granules 



(fig- 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-) 



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 



o 



FlQ. 76 Oxalate of Lime. Octa- 

 hedra and Hour-glass forms. 



FiQ. 77. Acid Urate of Ammonium. 



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

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



