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, chi, chloroplasts. 
(Sayre after Vines.) 
Fig. 41. —Stone cells from different sources. 1. 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). 
