24 MICROSCOPICAL DIAGNOSIS. 



Mix the tincture of iron with one ounce of the glycerine, and 

 the ferrocyanide of potassium, first dissolved in a little water, with 

 the other ounce. Mix these solutions together gradually, under con- 

 stant shaking. The iron solution must be added to the ferrocyanide 

 of potassium. Lastly, the water and acid are added, drop by drop, 

 under constant shaking. 



