568 



Howard : Tannin cells of persimmons 



tannin cells vary widely in the American, Chinese and Japanese 

 types. In the wild persimmon varieties of eastern North America, 

 the cells are about the same size and shape as the other paren- 

 chyma-cells around them, being nearly isometric in shape (figure 



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of the Office of Pomologicai Investigations, was found to contain 



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Figure i. Tannin cells from wild American persimmons. X 2 5* 



an immense number of these cells, which were not very greatly 

 different from those found in the American type, though commonly 

 somewhat pointed at the ends (figure 2). The most remarkable 

 tannin cells both as regards size and shape occur in the Japanese 



varieties 



In this type the cells are commonly cigar-shaped, in 

 some cases being five or ten times as long as wide and having an 



( 



If a small 



portion of the soft pulp from a thoroughly ripened fruit is spread 

 upon a slide or allowed to flow down the side of a test tube, the 

 individual cells can easily be seen with the naked eye. These dif- 

 ferences as shown in the different kinds are of especial interest in 



