URINE. 



255 



Transparency. Normal urine is ordinarily perfectly clear and 

 transparent when voided. On standing 1 for a variable time however, 

 a cloud (nubecula) consisting principally of nucleoprotein or mu- 

 coid (see p. 320) and epithelial cells forms. A turbidity due to the 

 precipitation of phosphates is normally noted in urine passed after a 

 hearty meal. The urine obtained 2-3 hours after a meal or later is 



x This dirty green or blue color also occurs after the use of methylene-blue 

 in the organism. 



