CORTEX GRANATI. POMEGRANATE. 



167 



periderm. On young, thin pieces of the drug there are 

 here and there, on the outside, thick layers of cork, which 

 consist of increased deposits of thick and thin-walled 

 cork cells, but mostly only of layers consisting of two or 

 four cells, which rest upon a layer of thin- walled cells. 

 The cork cells are seen from above to be irregularly 

 polygonal, but for the most part are quadrangular. In 

 this thickening only the inner wall of the cell takes part, 



Fig. 42. — Granatum. 

 Cross-section of portion of Granatum bark showing large stone 

 cell to left, parenchyma filled with calcium oxalate crystals and starch 

 grains, nt, The medullary rays, free from crystals (Moellcr). 



SO that it sometimes takes up half the width of the cell; 

 the remaining part of the cell wall is very thin. In young 

 bark there are distinct and regular lenticels; in old bark 

 these are very much flattened out. Next the cork layer 

 there is a layer of phelloderm, the cells filled with chlo- 

 rophyll and starch. Next to the phelloderm, and scarcely 

 to be differentiated from it, there is a narrow layer of cells, 

 which arises from the primary bark tissues. After this 



