102 



PHARMACEUTICAL BOTANY 



FIG. 40. Transverse section of part of leaf-stalk of a begonia, e. Epidermis; 

 c, cuticle; B, collenchyma, with walls thickened* at the angles v, chl, chloroplasts. 

 (Sayre after Vines.) 



FIG. 41. Stone cells from different sources. I. From coffee; 2, 3, and 4, 

 from stem of clove; 5 and 6, from tea leaf; 7, 8, and 9, from powdered star-anise 

 seed. (Stevens, after Moeller). 



