62 



IMMEDIATE PRINCIPLES OF THE TISSUES. 



Its crystals are usually tinged with a yellowish hue by the coloring 

 matter of the urine, and their various forms are represented by 

 Figs. 11 to 19. 



Fig. 15. 



Fig. 16. 



Uric acid rhombs replaced by square form. 



Uric acid hour-glass crystals. 



More uric acid is found in the urine during disturbed digestion, 

 the urea being at the same time diminished. (Lehmann.) It is in- 



Fig. 17. 



Fig. 18. 



Uric acid from urine. 



Uric acid as sometimes found crystallized on a hair. 



Fig. 19. 



creased by any obstruction of the circulation producing deficient 

 aeration of the blood; hence it increases 

 during fever, in heart diseases, and en- 

 largements of the liver; also very much 

 in acute articular rheumatism. It dimi- 

 nishes, however, in gout. 



In the urine, when discharged, it nor- 

 mally exists in combination with soda, and 

 is found in its free state an hour or more 

 afterwards. In some pathological states, 

 however, and in cases especially of uric 



Uric acid crystallized on a fibrin- ... .... ._. _- i ~-,s -i 



ous cast of a uriniferous tube, acid calculus (Figs. 20 and 21), it may be 



