CRUDE DRUGS. 



535 



Fig. 234. Transverse section of granatttm; K, corky layer composed of thin-walled 

 cork cells (k^) and thick-walled cork cells (k) only the inner walls (v) of which are thick- 

 ened; Pd, phelloderm cells; pr, some parenchyma cells of the primary cortex; Sk, stone 

 cells with thick, lamellated walls and fine branching pores; O, rosette aggregates of calcium 

 oxalate; O^, monoclinic prisms of calcium oxalate; m^, medullary rays; s, sieve cells; 

 p, parenchyma cells; c, cambium. After Meyer. 



