Plate IV. 

 3. Crystals of phenyl glucosazone from urine. 



Malpighian tuft 



I. Crystals of uric acid 

 from urine. 



Interlobular artery 



4. Section of cortex of injected kidney. 2. Crystals of ammonium urat< 



5. Section of medulla of Injected kidney 

 showing vasa recta uncJ col Lee ting tubules. 



