62 



the microscope shows the pus corpuscles, 

 in acid urines. 



This deposit is rare 



Blood. Red deposit ; the tincture of guaiac with hydrogen 

 dioxide gives a blue color. The spectroscope gives the charac- 

 teristic lines in the spectrum. The hemin test will show the 

 characteristic crystals. When blood is present the urine is gen- 

 erally albuminous. 



Some deposits not very abundant and having no special 

 chemical reaction may be recognized under the microscope. 



Neutral or Alkaline Urine. 



Alkaline Urates. More or less reddish deposits easily soluble 

 in boiling water and giving the murexide test. 



Triple Phosphate or Calcium Phosphate. A white deposit, 

 insoluble in boiling water, soluble in acetic acid, does not give 

 the murexide test; acidified with nitric acid, the molybdate of 

 ammonia solution gives a yellowish precipitate in the cold. 



Calcium Oxalate. White deposit insoluble in boiling water, 

 also in caustic potash and acetic acid. Soluble in hydrochloric 

 acid or in nitric acid; does not give the murexide test. 



Calcium Carbonate. White deposit insoluble in boiling 

 water or in caustic potash. Soluble with effervescence in acetic, 

 nitric or hydrochloric acids, does not give murexide reaction. 



Fig. 16. 

 A. — Spectrum of Oxy-hemoglobin. B. — Spectrum of Reduced Hemo- 

 globin. C. — Spectrum of Urobilin. 



