70 ILLLUSTJiA T/US.^ OF BEAN. 



ILLUSTRATIONS OF BEAN. 



Fi^. 2''^o. Transverse section of root of Bean, taken a short distance Leliind the apex of the main 

 root. The section passes through a Literal root, tc, trichomes ; e^>, epidermis ; j>c, paren- 

 chyma of cortex; ed, bundle-sheath (endodermis) ; c/j", pericambitim ; ^j»//, phloem bundle; 

 xy' . primary xylem bundle; re, root-cap (of lateral root). (Howes. j 



Fig. 284. Part of transverse section of the stem of Bean. c. cuticle; ap. epidermis; ep\ collen- 

 chyma ; J9C, parenchyma of cortex ; ch' . cambium ; xy' ' , xj-lem sclerenchyma ; xj), xylem 

 parenchyma ; xy' , primary xylem ; p<:' . parenchyma of pith ; rti?', medullary ray ; xy,i', xylem 

 ray; .v^, sieve-ttibes ; ph.?; phloem rays; j'-P- phloem jiarenchyma ; }>Ji' . hard bast (scleren- 

 chyma). (Howes.) 



Fig. 285. liadial longitudinal section of stem of Bean, corresponding to Fig, 284. Commencing 

 at the left side, the elements shown are : cuticle, epidermis, collenchj'ma, parench3-ma of cortex, 

 liard bast, jihloem parenchyma, soft bast (sieve-tubes), cambium, pitted vessels and xylem 

 sclerenchyma, xj'lem parenchyma, annular and sjiiral vessels, pith parenchyma. (Howes.) 



