CRUDE DRUGS. 



52Q 



hM '-^j^^-' 



Fig. 231a. Longitudinal section of cotton root bark; C, cork cells; P, parenchyma; 

 B, bast fibers; SR, secretion reservoirs; M, medullary rays; T, cells containing tannin; 

 K, rosette aggregates of calcium oxalate. After Morgan. 



34 



