PLATE XXYI. 



FIG. 192. 



FIG. 193. 









Tube-casts. 



Nitrate of Urea. 



FIG. 194. 



Urate of Ammonia. 



FIG. 196. 



Uric Acid. 



Uric Acid. 



FIG. 197. 





Uric Acid re-precipitated. 



