142 LABORATORY METHODS OF 



quantity is normal, or if it is divided easily, the quan- 

 tity is diminished. 



The presence of albumin in small quantity does not 

 make a change in the reaction of the chemicals. (For 

 clinical significance, see Tyson on Urine.) 



PHOSPHATES IN URINE. 



To 10 c.c. of urine add a small amount of ammonia. 

 Warm gently until the earthy phosphates begin to 

 separate. Set aside 10 or 15 minutes until they are 

 completely settled ; then measure the height of the pre- 

 cipitate, and if it is i mm. high, the quantity is normal. 

 (For clinical see Tyson on Urine.) This is the test 

 for the earthy phosphates. 



THE AUCAUNE PHOSPHATES 



are determined by adding to the urine a small quantity 

 of magnesium fluid, which precipitates the phosphates 

 into a cloudy precipitate. This cloud is normal. The 

 more the cloud, the more the phosphates. 



SULPHATES. 



To> a small amount of urine add a drop of barium- 

 chloride, and if a cloudiness is produced it indicates 

 that a normal quantity of sulphates are present. If a 



