THE URINE. 217 



urine holding fat in a free state may be called fatty ; that in 

 combination with albumen chylous ; and lastly, the urine in 

 which fat occurs in connexion with casein and sugar may be 

 denominated milky urine. 



Fatty urine has been observed to occur frequently in per- 

 sons labouring under phthisis ; the fat, as the liquid cools, 

 forming a thin pellicle on its surface, the nature of which 

 may be at once ascertained by the microscope, which, if it be 

 really fatty, will reveal the presence of innumerable fat 

 globules. 



Cases have been recorded in which the quantity of fat 

 has been so considerable that it could be detected with the 

 naked eye. 



Chylous Urine. 



Chylous urine is a white semi-opaque fluid, and contains 

 both fat and albumen ; the former may be detected by means 

 of the microscope, and the latter will be coagulated by heat, 

 by nitric acid, and the bichloride of mercury. Examined 

 microscopically, the coagulated albumen exhibits a granular 

 texture. 



This form of urine has been observed principally in cases 

 of gout. 



Milky Urine. 



True milky urine is of very rare occurrence, there being 

 but two or three well-authenticated cases of it recorded ; 

 urine containing the constituents of chyle having doubtless 

 been described, in many instances, as milky urine. 



The fat in milky urine occurs in combination with casein, 

 and probably with sugar also. 



The fatty constituent may be detected as in the pre- 

 viously described urines, the fatty and the chylous, by 

 means of the microscope, and the casein will be precipitated 

 by the addition of a little acetic, dilute -Sulphuric, or hydro- 

 chloric acid, the flocculi of which, examined microscopically, 

 will exhibit a granular, and even in many cases a globular 



