4i8 



DETECTION OF URINARY DEPOSITS. 



271. SCHEME FOR DETECTING URINARY DEPOSITS. I. In acid urine there may 

 occur 



1. An amorphous granular deposit: 



(a) "Which is dissolved by heat and reappears in the cold ; the deposit is often reddish in 

 - colour = urates (tig. 260). 



{!>) Which is not dissolved by heat, but is dissolved by acetic acid, but without efferves- 

 cence = probably tribasic calcic phosphate. 



(c) Small bright refractive granules, soluble in ether = fat or oil granules ( 41), (Lipajmia). 

 Fat occurs in the urine, especially when the round worm, Filaria sanguinis hominis, 

 is present in the blood ; sometimes, along with sugar, in phthisis, poisoning with 

 phosphorus, yellow fever, pysemia, after long-continued suppuration, and lastly, after 

 the injection of fat or milk into the blood ( 102). It occurs also in fatty degenera- 

 tion of the urinary apparatus, admixture with pus from old abscesses, and after severe 

 injuries to bones. In these cases attention ought to be directed to the presence of 

 cholesterin and lecithin. Very rarely is the fat present in such amount in the urine 

 as to form a cream on the surface (chyluria). 



^.. .- 





: & 



Fig. 279. 



.0 



Fig. 281. 



r 



i 



2** 



Hi 



(j 



Fig. 280. Fig. 282. Fig. 283. 



Fig. 279. Coarsely granular casts. Fig. 280. Hyaline casts, a ; b, with leucocytes ; c, with 

 renal epithelium. Fig 281. a, Granules of calcic carbonate of lime ; b, c, crystalline neutral 

 calcic phosphate. Fig. 282. Ammonio-magnesic phosphate. Fig. 283. Imperfect forms 

 of the same. 



2. A crystalline deposit may be 



(a) Uric acid (fig. 256). 



(b) Calcium oxalate (fig. 258) octahedra insoluble in acetic acid. 



(c) Cystin (fig. 271). 



(d) Leucin and tyrosin very rare (tig. 272). 

 II. In alkaline urine there may occur 



1. A completely amorphous granular deposit, soluble in acids without effervescence = 

 tribasic calcic phosphate. 



