120 CHEMICAL PHYSIOLOGY. 



(c.) Add Millons' reagent = a beautiful red colour or 

 deposit. This reaction is aided by heat. 



7. Pyrocatechin is sometimes found in urine. The method of 

 obtaining it requires too much time to be done in this course. 



Tests. 



(a.) To a dilute solution add ferric chloride = a green 

 colour, which becomes violet on the addition of sodic bicar- 

 bonate. 



(b.) Add ammonia and silver nitrate, which give a black 

 precipitate of reduced silver. 



LESSON XXL 



URINARY DEPOSITS CALCULI AND 

 GENERAL EXAMINATION OF THE URINE. 



1. Mode of Collecting Urinary Deposits. Place the urine in a 

 conical glass, cover it, and allow it to stand for twelve hours. 

 Note the reaction before and after standing. With a pipette 

 remove some of the deposit and examine it microscopically. 

 There are two classes of deposits, organised and unorganised. 



ORGANISED DEPOSITS. 



1. Pus (p. 120). 



2. Blood (p. 112). 



3. Epithelium. 



4. Renal tube casts. 



5. Spermatozoa. 



6. Micro-organisms. 



7. Elements of morbid growths 



and entozoa. 



2. Pus in Urine (Pyuria) produces a thick creamy yellowish- 

 white sediment after standing, although its appearance varies 

 with the reaction of the urine. If the urine be acid, the precipi- 

 tate is loose, and the pus corpuscles discrete ; if alkaline, and 

 especially from ammonia, it forms a thick, tough, glairy mass. 

 The urine is usually alkaline, and is always albuminous, and 

 rapidly undergoes decomposition. Pus is found in the urine in 

 leucorrhcea in the female, gonorrhoea, gleet, cystitis, pyelitis, 

 from bursting of an abscess into any part of the urinary tract, &c. 



