il. 141, Bureau of Chemistry, U. S. Dept. of Agriculture. 



Plate I. 



The Giant Tannin Cells of the Japanese Persimmon. 



These are so large that by smearing some of the soft pulp of the persimmon on a glass slide and 

 holding it up to the light they can be easily seen with the naked eye. They turn bluish-black 

 like ink if treated with iron chlorid. These cells are the tannin containers, and as the fruit 

 ripens their contents change in character and become highly refractive and apparently 

 insoluble. 



