URINALYSIS. 151 



Method : Pour in the tube some of the urine and heat 

 it, and if a cloudy precipitate appears, the sediment is 

 due to earthy phosphates. If the cloud remains after 

 the addition of an acid, it may be due to albumin ; if it 

 disappears, it may be due to the presence of phos- 

 phates; if it disappears on the addition of heat alone 

 it is due to urates; if on the addition of an acid the 

 piecipitate disappears with the evolution of gas, the 

 precipitate is due to carbonates. 



What is the cause of ammoniacal odor in urine that 

 has been standing for a while at a moderate tempera- 

 ture? 



What causes the white precipitate that forms at the 

 bottom of the vessel? 



How can you tell when the alkalinity is due to a 

 fixed alkali or to a volatile alkali? 



Method : Test a sample of urine with litmus paper, 

 then dry the paper, and if the blue remains, the 

 alkalinity is due to a fixed alkali; if the blue disap- 

 pears, it is due to a volatile alkali. 



NUCI<0- ALBUM IN. 



Test for nucleo-albumin. This is a very simple test. 

 It is performed as follows : Take a small quantity of 

 the urine to be tested and dilute the sample to reduce 

 the salts that hold the albumin or mucin, which can 



