164 



MISSOURI BOTANICAL GARDEN. 



with thickened walls and large tannin content: 27 shows the tannin 

 in and near the embryo; 28 shows the tannin in the embryo; 27a. 

 Large tannin content of the endosperm cells of the chalazal cul-de- 

 sac where the secondary thickening of the cells has gone on as in the 

 main mass of endosperm. 30. Transverse section of seed near ma- 

 turity in the endosperm of which tannin still is present in certain 



condition. All the 



Diagrammatic rep- 



s, Stone cells; p, 



sectors. 



integuments 



cross-hatched cells contain tannin. 32, Exocarp. 



ermis 



Parenchyma, of which a few cells are drawn here and there to show 

 their relative sizes; id. tannin idioplasts. 33, Outer exocarp to show 

 the tannin cells in the hypodermal layer, and the tannin globules in 

 the parenchyma adjacent to the stone cells, st. (Rhars). 34, Endo- 

 carp in transverse section, t f elongated tannin element 







